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POST-LABORATORY QUESTIONS 1. A vast majority of crystallization procedures call for the use of methanol or ethanol as the crystallization solvent. Why are these preferred over larger alcohols such as 2-butanol (which have a similar solubility)? 2. A sample of aspirin is contaminated with table salt and sand. Aspirin can be recrystallized from water. In which steps are the salt and sand removed? 3. The table below provides the solubilities of compounds A and B in ethanol. 100 0.1 7.0 7.0 0.9 1.3 You are purifying 10 g of compound A contaminated with 1 g of compound B a Calculate the minimum volume of ethanol that you would need to crystallize the sample. Calculate the % Recovery ofA upon stal!ization, disregarding experimental losses. b. c. Is A pure after crystallization? Is A pure after crystallization if A (10 g) is contaminated with 1.5 g of B? What is the % ofA in the crystallized product? d. 41
POST-LABORATORY QUESTIONS 1. A vast majority of crystallization procedures call for the use of methanol or ethanol as the crystallization solvent. Why are these preferred over larger alcohols such as 2-butanol (which have a similar solubility)? 2. A sample of aspirin is contaminated with table salt and sand. Aspirin can be recrystallized from water. In which steps are the salt and sand removed? 3. The table below provides the solubilities of compounds A and B in ethanol. 100 0.1 7.0 7.0 0.9 1.3 You are purifying 10 g of compound A contaminated with 1 g of compound B a Calculate the minimum volume of ethanol that you would need to crystallize the sample. Calculate the % Recovery ofA upon stal!ization, disregarding experimental losses. b. c. Is A pure after crystallization? Is A pure after crystallization if A (10 g) is contaminated with 1.5 g of B? What is the % ofA in the crystallized product? d. 41
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Hubert KochLv2
28 Mar 2019
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