All are properties of ideal solvent for recrystallization except: • Dissolves the sample when hot • Does not react with the target compound • Immiscible with the impurity • Has a boiling point above the sample's melting point

All are properties of ideal solvent for recrystallization except: • Dissolves the sample when hot • Does not react with the target compound • Immiscible with the impurity • Has a boiling point above the sample's melting point

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter13: Isolation Of Eugenol From Clov

Section: Chapter Questions

Problem 9Q

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[three]

All are properties of ideal solvent for recrystallization except:
• Dissolves the sample when hot
• Does not react with the target compound
• Immiscible with the impurity
• Has a boiling point above the sample's melting point

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Select all the statements below that are correct about Recrystallization O By dissolving both impurities and a compound in an appropriate solvent, either the desired compound or impurities can be removed from the solution O Recrystallization is a technique that results in crystal purification O Recrystallization should only be performed with a solvent that boils at room temprature O Hot filtration can be used to separate impurities that are insoluble in the boiling solvent O Impurities are removed from a crystal lattice with rapid cooling during the Recrystallization process O Recrystallization is a type of synthesis reaction
O An ideal recrystallization solvent a) Dissolves the solid when hot and insoluble when cold b) Insoluble when hot and dissolves the solid when cold c) Insoluble when hot or cold d) Soluble when hot or cold Which offers the best separation simple distillation or fractional distillation and why?
A saturated solution: will rapidly precipitate if a seed crystal is added. contains no double bonds. contains dissolved solute in equilibrium with undissolved solid. contains as much solvent as it can hold.
If the hot solution is supersaturated with the compound, as the solution cools, it may enter a supercooled state wherein the crystals would precipitate but would not have a nucleation site on which to start forming. If this occurs, which of the following can be done to induce recrystallization? CHOICES: Add a seed crystal Increase the volume of the solvent used Further heat the solution and gradually cool in an ice bath Avoid scratching the sides or bottom of the flask
Which of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.
A group was given the responsibility of performing a recrystallization experiment in their laboratory to see if the three newly found solvents could purify and separate a mixture including compounds A and B. The following are the solubilities of the two compounds in g/100 mL of hot and cold solvents: Solubility in g/100 mL solvent A B Solvent Hot Cold Hot Cold 1 4.60 1.10 5.30 1.90 2 6.40 5.80 8.40 1.10 3 9.70 3.30 6.80 1.70 What is the %recovery and %purity of A and B in the chosen solvent? Show solutions pls
Why is recrystallization not applicable to samples which contain large amount of impurities?
b) Will the sample be contaminated with any of the impurities? Calculate the percent purity of the initial sample (in terms of compound A) - ( i.e. express the amount of compound A in the initial sample as a percentage of the mass of initial sample). Calculate the percent purity of the final sample (in terms of compound A) - (i.e. express the amount of compound A in the final sample as a percentage of the mass of final sample). Did the recrystallization procedure result in an increase of the percent purity of compound A in the sample? Comment on the results.
If a small amount of impurity is present in a sample, what will be its effect on the melting point of the sample?
Draw an outline of the recrystallization process- Assume all types of Impurities(Soluble, Insoluble and colored) are present.
Simple and fractional distillation
A student performs a crystallization on an impure sample of biphenyl. The sample weighs 0.5 g and contains about 5% impurity. Based on his knowledge of solubility, the student decides to use benzene as the solvent. After crystallization, the crystals are dried and the nal weight is found to be 0.02 g. Assume that all steps in the crystallization are performed correctly, there are no spills, and the student lost very little solid on any glassware or in any of the transfers. Why is the recovery so low?