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Crystallization of benzoic acid using water to lose weight –

These alcohols form hydrogen bond with water due to the polar —OH functional group. No Downloads.

After noting the solubility properties of the solid, you can choose the appropriate crystallization of benzoic acid using water to lose weight method. Crystal observed that the solid was insoluble in water at room temperature, but weigh in hot water. If no crystals have formed by then, try to induce crystallization by scratching the inner side of your flask at the interface of the solution with a glass rod and wait a few more minutes. Lab: Properties of Polar and Nonpolar Substances Purpose: To explain the interactions of matter in relation to polarity. FAQ: When I tested the recrystallization solvent in a test tube it worked, but now my sample won't dissolve!

  • Return to Top Q: Can I put my hot solution directly into the ice bath? A student recrystallized some impure benzoic acid and isolated it by filtration.

  • The most commonly used recrystallization solvents are presented in the following table. If color persists, repeat this process.

  • Cholesterol 1 is a major component of cell membranes. The ice-cold flask and contents were swirled and poured onto the Buchner funnel under reduced pressure.

  • Purification of your products must be performed to remove by-products and impurities. How much would be lost in the recrystallization, that is, would remain in the cold solvent?

THE RECRYSTALLIZATION OF BENZOIC ACID

WordPress Shortcode. Are you sure you want to Yes No. Introduction when synthesis of compounds occurs in the laboratory, they are separated from impure compounds through recrystallization.

FAQ: When using the two-solvent recrystallization method, why is it necessary to keep both solvents hot when adding? Apparatus More information. To modify a known procedure to prepare an unknown. She also noted that the solid was insoluble in ethyl acetate at room temperature.

Return crystqllization Top Q: If we add too much solvent, do we just boil it off? Unit 2 Mixtures and Pure Substances Matter can be classified into two groups: mixtures and pure substances. Allowing the flask to cool slowly will give the best-shaped crystals after about minutes. Mixtures and Pure Substances Unit 2 Mixtures and Pure Substances Matter can be classified into two groups: mixtures and pure substances.

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Experiment 4 purification - recrystallization of benzoic acid. Fig 1 benzoic acid solution Erlenmeyer flask hot plate Fig 1- Dissolving benzoic acid Remove the flask from the hot plate and examine the solution. The percentage recovered for naphthalene and benzoic Acid being high was an indication that the initial sample in our procedure had a low concentration of impurities. Like this document?

Regardless of crystallization method, the purity of the solid can be verified by taking the melting point. Goal: The goal of this week's lab is to recrystallize the benzoic acid you isolated last week. Compounds, which are less soluble, will crystallize first. Now customize the name of a clipboard to store your clips. Grab Discount.

Weigbt will be the result of cooling the solution in this manner? Transfer the product to a watch glass and allow it to dry until the next lab. Low solubility at low temperatures minimizes the amount of purified compound that will lose during recrystallization. The client can upload extra material and include additional instructions from the lecturer. Recrystallization process depends on critical conditions such as choice of solvent.

Isolation of Caffeine from Tea Isolation of Caffeine from Tea Introduction A number of interesting, biologically active compounds have been isolated from plants. Q: When we are acjd our crystals using vacuum filtration, what solvent do we use to wash our crystals? Most of the other types of measurements are combinations. Teacher Advanced Version Freezing point depression describes the process where the temperature at which a liquid freezes is lowered by adding another More information. What More information. Explain this behavior.

THE RECRYSTALLIZATION OF BENZOIC ACID

Benzoicc to Top Q: When I tested the recrystallization solvent in a test tube it worked, but now my sample won't dissolve! Most of the other types of measurements are combinations More information. Rinsing with 1 or 2 mLs of cold water helps get the crystals out of the flask, and rinsing helps remove impurities.

Successfully reported this slideshow. Full Name Comment goes here. You can get professional academic help from our service at affordable rates. Pahlavan 2 A suitable recrystallization solvent should also be partially volatile in order to be easily removed from the purified crystals.

In the real world, this will never happen and recrystallization is a technique that has to be practiced and perfected. These compounds are not be purified due to possible amounts of contaminants. Show related SlideShares at end. The process of recrystallization is used to purify a solid and remove the impurities. Addition of boiling water to impure crystals.

  • This is of course not a perfect process, but it does increase the purity of the final product.

  • The purpose of this experiment is to learn the technique of recrystallization by purifying benzoic acid.

  • Safety: Goggles and closed shoes must be worn.

  • Solution after the addition of charcoal.

  • The Acid is recovered using a solvent such as water.

In the former case, the impurity could be filtered off at high temperature, while in the latter case the impurity would completely aciid in solution upon cooling. Purification of your products must be performed to remove by-products and impurities. Give some reasons why Suction filtration vacuum is to be preferred to gravity filtration. For naphthalene, the recrystallization process was carried as expected. You will compare the melting point of this impure sample to the benzoic acid recovered from recrystallization.

The purpose of this experiment is to learn the technique of recrystallization by purifying benzoic acid. This means, once you have added hot solvent, bring the solution to a boil, then wait about 20 seconds. Allowing the flask to cool slowly will give the best-shaped crystals after about minutes. Fig 2 vacuum suction filtrate benzoic acid Buchner funnel Fig.

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The objective is to dissolve the entire solid in only as ising as hot or near boiling solvent water as is necessary. It will also help to eliminate unnecessary revisions. If you continue browsing the site, you agree to the use of cookies on this website. These alcohols form hydrogen bond with water due to the polar —OH functional group.

  • By this process, you will obtain a saturated solution.

  • Calculate the percent recovered using the following written formula and determine the melting point of your recrystallized benzoic acid.

  • This process helps remove solvent vapors. In an Erlenmeyer flask Crystal dissolved about 1 g of the solid in about 5 mL of hot water by heating on a hot plate with swirling to make a fine slurry.

  • All More information. Reduce the volume until you find that just a little more solvent needs to be added to completely dissolve the crude solid.

The water should filter quickly - if not, check for vacuum leaks. What volume of acetone would be required to purify a 5. The container of solution was placed in an ice-water bath instead of being allowed cooling slowly. Download with free trial.

Slowly add the boiling water to the benzoic acid crystals until they dissolve. The Acid is recovered using a solvent such as water. Experiment 4 purification - recrystallization of benzoic acid. Removal of charcoal via gravity filtration. Pure homogeneous compounds consist of the same molecules and have similar structures. The solvent should not react with the compound being purified and it should have the boiling point below the melting point of the compound being purified because solid melts before dissolves oiling out. Post Lab questions This will not have any effect on the expected results because phenacetin is more soluble in hot water than in the cold water.

Powered by Join. Then use a spatula to lift the filter paper and crystals out of the Buchner funnel, then press them as dry as possible on a large clean paper towel hand dryallow them to dry completely, and transfer the dry sample to a pre-weigh weighing paper. Give some reasons why Suction filtration vacuum is to be preferred to gravity filtration. If the solution is completely clear though not necessarily colorless and no solid benzoic acid is visible, then add additional ml water to the mixture and place the Erlenmeyer flask on a countertop where it will not be disturbed and cover with an upside-down small beaker to prevent dust contamination.

Determine the weigh the DRY crystals of recovered benzoic acid. Mixed Recrystallization of Dibenzylacetone 3. What is the ideal solvent for crystallization of a particular compound? The most commonly used recrystallization solvents are presented in the following table. Most of the other types of measurements are combinations.

Danoo Kurdi. Off this experiment, a technique was used that can be used frequently in such recrystallization experiments. What is the ideal solvent for crystallization of a particular compound? Murtaza Altemimy. Several techniques for purifying these compounds have been developed. Transfer the product to a watch glass and allow it to dry until the next lab. Why we are the best.

We have a team of professional academic writers who can handle all your assignments. If crystallization does not occur after 10 benzpic, scrape the sides of the flask above the level of the solution with the sharp end of a glass rod hard enough to audibly scratch the interior surface of the flask. Download with free trial. You can get professional academic help from our service at affordable rates. Recrystallization is a process where purification of substances is done when substances form solids at room temperature, leaving the impurities as a liquid.

  • Crystals of pure salicylic acid slowly began to appear in the flask. The Molar Mass of a Gas Goals The purpose of this experiment is to determine the number of grams per mole of a gas by measuring the pressure, volume, temperature, and mass of a sample.

  • He was surprised that most of the white solid melted sharply between and o C but that a small amount remained unmelted even at temperatures above o C. Comments 0.

  • To do this, all solvents must be hot before you add them.

  • To measure the solubility of a salt in water over a range of temperatures and to construct a graph representing the salt solubility. What volume of acetone would be required to purify a 5.

  • A good suitable recrystallization solvent will dissolve a large amount of the impure compound at temperatures near the boiling point of the solvent.

Decolorization is dealt with by adding decolorizing charcoal Norit and crystallization of benzoic acid using water to lose weight performing a hot gravity filtration. Physical Properties of a Pure Substance, Water Physical Properties of a Pure Substance, Water The chemical and physical properties of a substance characterize it as a unique substance, and the determination of these properties can often allow one to More information. Allowing the flask to cool slowly will give the best-shaped crystals after about minutes. Connect the side arm of the test tube to a vacuum source, preferably the water aspirator or house vacuum. This is of course not a perfect process, but it does increase the purity of the final product. If the crystals do not form, initiate the process with one of the methods used to induce nucleation. To examine the effect of a common ion on the solubility of slightly.

Return to Top Q: If we add too much solvent, do we just boil it off? Acid-Base Extraction. The container of solution was placed in an ice-water bath instead of being allowed cooling slowly. What is the primary consideration in choosing a solvent for crystallizing a compound?

Download with free trial. A growing crystal will only accept similar entities into its lattice. How can one prevent oiling out? Next Post. Downloads

Get Professional Assignment Help Cheaply Are you busy and do not have time to handle your assignment? Downloads Clipping is a weigt way to collect important slides you want to go back to later. We have a team of professional academic writers who can handle all your assignments. The minimum requirement to be an essay writer with our essay writing service is to have a college diploma.

Powered by Join. Any impurity present in a solid sample will remain in the aqueous solution, and only pure solute will be on the filtered paper. Start on. We have a team of professional academic writers who can handle all your assignments. Are you scared that your paper will not make the grade? Rinsing with 1 or 2 mLs of cold water helps get the crystals out of the flask, and rinsing helps remove impurities.

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Pure Solid Compounds: Molecules aid together in rigid formations by intermolecular forces. Then use a spatula to lift the filter paper and crystals out of the Buchner funnel, then press them as dry as possible on a large clean paper towel hand dryallow them to dry completely, and transfer the dry sample to a pre-weigh weighing paper. Name Lab 3: Solubility of Organic Compounds Objectives: Introduction: soluble insoluble partially soluble miscible immiscible Lab 3: Solubility of rganic Compounds bjectives: - Understanding the relative solubility of organic compounds in various solvents.

  • Q: When using the two-solvent recrystallization method, why is it necessary to keep both solvents hot when adding? Give some reasons why Suction filtration vacuum is to be preferred to gravity filtration.

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  • Heating the solvents decreases the kinetic energy necessary to dissolve the compound.

  • Small amount of compound being purified should remain in solution at low temperatures, between approximately 25 and 5 o C. Murtaza Altemimy.

  • Pay for the order Proceed to pay for the paper so that it can be assigned to one of our expert academic writers. What is the primary consideration in choosing a solvent for crystallizing a compound?

Apparatus More information. He scraped the purified benzoic acid off the filter paper after it had dried and took the melting point as a test for purity. Sample name 2. Visibility Others can see my Clipboard.

Compounds, which are less soluble, will crystallize first. Rinsing with 1 or 2 mLs of cold water helps ot the crystals out of the flask, and rinsing helps remove impurities. How can one prevent oiling out? Transfer the product to a watch glass and allow it to dry until the next lab. Solution after the addition of charcoal.

Keep the Erlenmeyer flask on a steam bath as you carry out the remainder of the recrystallization process. A compound is always more soluble in hot solvents than in cold solvents. The solubility of the compound in the solvent used for recrystallization is important. Why Choose Us?

He was surprised that most of the white solid melted sharply between and o C but that a small amount remained unmelted even at temperatures above o C. Full Name Comment goes here. In selecting a solvent consider that like likes like. The compound is dissolved in a minimum amount of the hot solvent in which it is more soluble. Cancel Save.

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See our Privacy Policy and User Agreement for details. We will study and More information. FAQ: I have a really lousy watfr from that water aspirator. Organic Lab 1 Make-up Experiment. Heat the first solvent and add a minimum of the hot solvent to your crude product to dissolve it dropwise addition. You want to use 1 or 2 boiling stones for about every mL of liquid.

Grab Discount. What is the ideal solvent for crystallization of a particular compound? Get all the crystals out of cryztallization flask using a spatula or stirring rod. In the former case, the impurity could be filtered off at high temperature, while in the latter case the impurity would completely stay in solution upon cooling. In the real world, this will never happen and recrystallization is a technique that has to be practiced and perfected.

This allows for a saturated solution and for crystallization to occur upon cooling. An egg yolk contains about milligrams of cholesterol. But not all More information.

  • Have you ever read the newspaper More information. For example, consider the compound TiCl 4 titanium chloride.

  • Some commonly used solvent pairs are water-ethanol, acetic acid — water, ether-acetone.

  • Data for recrystallized benzoic acid a. You need to cool the solution first to room temperature before placing it in the ice-water bath.

Goal: The goal of benzoic acid using week's lab is to recrystallize the benzoic acid you isolated last week. Lab 4 Taking Apart the Pieces How does starting your morning out crjstallization relate to relief from a headache? If there are any impurities that have the same solubility as the main component, then a different solvent needs to be chosen. We will use common household bleach that. Pre-Lab Notebook Content: Your notebook should include the title, date, purpose, procedure; data tables. Types of Intermolecular Forces? Permission for academic use provided the original copyright is included Every substance has a unique set More information.

The ratio of the masses of the elements in a compound, while constant. When chemicals are present More information. Experiment Determination of Molecular Acid using water by Freezing Point Depression 1 Experiment Determination of Tp Weight by Freezing Point Depression Objective: In this experiment, you will determine the molecular weight of a compound by measuring the freezing point of a More information. The process most often More information. A good suitable recrystallization solvent will dissolve a large amount of the impure compound at temperatures near the boiling point of the solvent. Recrystallization of an Unknown Background Review: More information. What is a hydrocarbon?

All rights reserved Reproduction permitted for educational purposes as long as the original copyright cryxtallization included. If a single solvent cannot be found that is suitable for recrystallization, a solvent pair often used. Experiment 3 Separation by Solvent Extraction Objectives To separate a mixture consisting of a carboxylic acid and a neutral compound by using solvent extraction techniques. The flask and contents were cooled further in an ice-water bath for about 20 minutes.

Size: px. Danoo Kurdi. When vacuum filtering, wash your crystals with the solvent you used to recrystallize your compound.

The charcoal should remove all of the colored impurities. This is of course not a perfect process, but it does increase the purity of the final product. Keep adding water in small amounts several drops at a time from a Pasteur pipette until all of the benzoic acid is dissolved and the solution is boiling. Access to a pool of experts Experienced writers Timely delivery Any kind of assignment Subject-relevant writer Full compliance with instructions Direct communication with your writer Get superb grades consistently Get Started Now. The lattice formation of the benzoic acid will usually prevent the larger colored molecules from entering.

Physical Properties of a Pure Substance, Water The chemical and physical properties of a substance characterize it as a crystallizafion substance, and the determination of these properties can often allow one to. Solution 1. Use solubility tests to determine a suitable recrystallization solvent. A familiar example of the first case is. Melting point of recrystallized benzoic acid o C e.

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The chief problem with the isolation is that caffeine does not exist alone in the tealeaves, but other natural More information. Organic Lab 1 Make-up Experiment Extraction of Caffeine from Lose weight Introduction Few compounds consumed by Americans are surrounded by as much controversy as caffeine. The two solvents should be completely miscible and preferably have similar boiling points. Physical Properties of a Pure Substance, Water Physical Properties of a Pure Substance, Water The chemical and physical properties of a substance characterize it as a unique substance, and the determination of these properties can often allow one to More information. The word stoichiometry.

Allowing the flask to cool slowly will give the best-shaped crystals after about minutes. Keep adding water in small amounts several drops at a time from a Pasteur pipette until all of water lose benzoic acid is dissolved and the solution is boiling. Why is using too much charcoal not a good idea? If the solution is completely clear though not necessarily colorless and no solid benzoic acid is visible, then add additional ml water to the mixture and place the Erlenmeyer flask on a countertop where it will not be disturbed and cover with an upside-down small beaker to prevent dust contamination.

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Recrystallization bemzoic a process where purification of substances is done when substances form solids at room temperature, leaving the impurities as a liquid. Calculate the percent recovered using the following written formula and determine the melting point of your recrystallized benzoic acid. The minimum requirement to be an essay writer with our essay writing service is to have a college diploma.

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  • She also noted that the solid was insoluble in ethyl acetate at room temperature. Students will distinguish between polar and non-polar molecules.

  • Thus, she performed hot gravity filtration. Engineeringfragrance make a deodorant practical activity 2 student instructions page 1 of 5 chemical compounds The most common active ingredient used in deodorants is aluminium chlorohydrate.

This may dislodge some undetectable, small crystals that will drop into the solution and "seed" the solution, helping to induce crystallization. Powered by Join. Fig 1 benzoic acid solution Erlenmeyer flask hot plate Fig 1- Dissolving benzoic acid Remove the flask from the hot plate and examine the solution. Cooling the solution in an ice bath may also help at this point. Home Explore Login Signup.

If you think you might have used too much solvent, you can concentrate your solution by boiling off some of your solvent. Probability helps us to crystallixation. Heat the first solvent and add a minimum of the hot solvent to your crude product to dissolve it dropwise addition. What are the purposes of the following in recrystallization of solids? Calculate the percent recovered using the following written formula and determine the melting point of your recrystallized benzoic acid. FAQ: How long does it take for the crystals to grow? Disturbing it can lead to the formation of small crystals and the incorporation of impurities in the crystal lattice.

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Receive a paper. He was surprised that most of the white solid melted sharply between and o C but that a small amount remained unmelted even at temperatures above o C. Full Name Comment goes here.

What is the ideal solvent for crystallization of a particular compound? Now customize the name of a bdnzoic to store your clips. In the former case, the impurity could be filtered off at high temperature, while in the latter case the impurity would completely stay in solution upon cooling. The most basic of these techniques for the purification of organic solids is recrystallization, which relies on the different solubilities of solutes in a solvent. Calculate the percent recovered using the following written formula and determine the melting point of your recrystallized benzoic acid.

Get all the crystals out of the flask using a spatula or stirring rod. Like Liked. Place an order You fill all the paper instructions in the order form. Add about 20 ml distilled water, using a graduated cylinder, to the flask and bring the mixture to the boiling point by heating on a hot plate, while stirring the mixture and boiling gently to dissolve benzoic acid completely. Compound X is quite soluble in toluene, but only slightly soluble in petroleum ether. Molecules have unique solubility properties. If crystallization does not occur after 10 minutes, scrape the sides of the flask above the level of the solution with the sharp end of a glass rod hard enough to audibly scratch the interior surface of the flask.

Structural formula of the benzoic acid 7. What More information. Chapter 13 - Solutions Types of Mixtures I. We all know that. Melting Range 1 Experiment 2 Background Information The melting range of a pure organic solid is the temperature range at which the solid is in equilibrium with its liquid.

Pahlavan 4 Experimental Procedures Using a weighing paper, weigh out about 1. We will study and. After discussing these observations with Bea, Crystal decided to use the single solvent recrystallization method since the solvents which might be used in the two solvent method are not miscible and thus not suitable.

Introduction Steam Distillation crystallizatioon Lemongrass Oil When a mixture of cyclohexane and toluene is distilled, the boiling point of these two miscible liquids is between the boiling points of each of the. Dispose of all chemical in the plastic. We will use common household bleach that More information. Recrystallization is a method of purifying a solid. The dissolving More information.

Give some reasons why Suction filtration vacuum is to be preferred to gravity filtration. Remember to review the safety sections and wear goggles when appropriate. The two solvents should be completely miscible and preferably have similar boiling points. The solvents must be miscible in one another.

What is the primary consideration in choosing a solvent for crystallizing a compound? The compound is dissolved in a minimum amount of the hot solvent in which it is more soluble. Experiment 8 Synthesis of Aspirin Aspirin is an effective analgesic pain relieverantipyretic fever reducer and anti-inflammatory agent and is one of the most widely used non-prescription drugs. This is not surprising More information. Experiment 1 Post-Game Show.

A suitable solvent is one which readily dissolves the solid solute when the solvent is hot but not when it is cold. No notes for slide. Lipids include. When chemicals are present More information. Show More. This may dislodge some undetectable, small crystals that will drop into the solution and "seed" the solution, helping to induce crystallization. Start on.

Note: Depending on how pink your crystals are, you may not need to add any charcoal. Next Post The Recruitment of nurses in Canada. Our essay writers are graduates with diplomas, bachelor's, masters, Ph. Purification by recrystallization; This technique allows for the purification of crude material.

Introduction Lipids are naturally occuring substances that are arbitrarily grouped together on the basis of their insolubility in water a polar solvent and solubility in nonpolar solvents. Comments 0. Hot gravity filter the hot solution if impurities are present.

Insoluble impurities can be filtered by hot gravity filtration. FAQ: How many boiling stones should I use? Learning how to perform a vacuum. What would be the maximum theoretical percent recovery from crystallization of 5. Liquids are customarily purified by distillation, while solids are purified by recrystallization sometimes called simply "crystallization". In addition the impurity either would be completely insoluble in the particular solvent at the high temperature, or would be very soluble in the solvent at low temperature.

When assigning your order, we match the paper subject with the area of specialization of the writer. Why Choose Us? Data for recrystallized benzoic acid a. The charcoal should remove all waer the colored impurities. Recrystallization is a process where purification of substances is done when substances form solids at room temperature, leaving the impurities as a liquid. There are two types of impurities: those more soluble in a given solvent than the main component and those less soluble. Add about 20 ml distilled water, using a graduated cylinder, to the flask and bring the mixture to the boiling point by heating on a hot plate, while stirring the mixture and boiling gently to dissolve benzoic acid completely.

How can one prevent oiling out? Experiment 9 Synthesis of a opper oordination omplex and Aspirin with Demonstrations of the Synthesis of Nylon, Bakelite, and Polyvinyl Alcohol Slime Synthesis of tetraamminecopper ii sulfate, [u n 3. We will study and.

The most commonly used recrystallization solvents are presented in the following table. Typically, the compound being recrystallized will be more soluble in one solvent than the other. Goal: The goal of this week's lab is to recrystallize the benzoic acid you isolated last week. Actions Shares. Explain this behavior.

To learn about Isomerism. Pure Solid Compounds: Molecules held together in rigid formations by intermolecular forces. In practice you purify by slowly cooling a hot, saturated solution of your compound. What volume of acetone would be required to purify a 5.

Mixtures and Pure Substances Unit 2 Mixtures and Pure Substances Matter can be classified into two groups: mixtures and pure substances. Did you have water in your test tube? Brian Anderson Fall Experiment 1 Post-Game Show pipette and burette intensive and extensive properties interpolation determining random experimental error What about gross error More information. Safety: Goggles and closed shoes must be worn. Collect the filtrate in a mL Erlenmeyer flask.

View the videos: 4. Determining percent yield. Do not move the flask during the crystal formation phase. Page 1 of 5.

Get all the crystals out of the flask using a spatula or stirring rod. Home Explore Login Signup. Like Liked. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Compound X is quite soluble in toluene, but only slightly soluble in petroleum ether. You communicate with the writer and know about the progress of the paper. WordPress Shortcode.

Danoo Kurdi. The solubility of the compound in the solvent used for recrystallization is important. Why we are the best. The percentage recovered for naphthalene and benzoic Acid being high was an indication that the initial sample in our procedure had a low concentration of impurities. Recrystallization process depends on critical conditions such as choice of solvent.

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