Laboratory Techniques in Organic Chemistry
4th Edition
ISBN: 9781464134227
Author: Jerry R. Mohrig, David Alberg, Gretchen Hofmeister, Paul F. Schatz, Christina Noring Hammond
Publisher: W. H. Freeman
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Chapter 9, Problem 3Q
Interpretation Introduction
Interpretation:
The reason for the use of gravity filtration rather than vacuum filtration for a hot recrystallization solution should be determined.
Concept introduction:
Filtration is a physical process that is used to separate solid matter from a liquid by the addition of a filter medium through which only the liquid can pass. Gravity filtration is one of the methods of filtration of impurities from solutions by the use of gravity to pull liquid through a filter paper while the vacuum filtration technique can be done by the use of funnels with flat, perforated and porous surfaces.
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What are the differences between a simple distillation and steam distillation?
2. When performing the recrystallization of an impure solid, why is it advised to use the minimal amount of solvent possible?
Group of answer choices
To minimize the amount of pure solid lost due to its solubility.
To minimize the cost of the recrystallization.
To reduce the time needed to filter the pure solid from the solvent after recrystallization.
To minimize the amount of hazardous materials used.
Why is recrystallization not applicable to samples which contain large amount of impurities?
Chapter 9 Solutions
Laboratory Techniques in Organic Chemistry
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Similar questions
- Briefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.arrow_forwardWhy is fractional distillation more efficient than simple distillation when purifying liquid mixtures?arrow_forwardQ1. Give three criteria for a good recrystallization solvent. Q2. You want to purify 10 grams of benzoic acid that has been contaminated with 0.2 g of salicylic acid. You are given the following data: Solubility in water at 20 °C Solubility at 100 °C (g/10 ml) Compound (g/10 ml) Benzoic Acid 0.029 0.680 Salicylic Acid 0.680 0.029 0.22 6.67 a) What volume of Boiling water is needed to dissolve the 10 g of benzoic acid? (show calculations) b) How much benzoic acid will crystallize after cooling to 20 °C (show calculations) c) Will any salicylic acid crystals form? Why or why not? (show calculations/ reason for answer) d) What is the maximum amount of benzoic acid that could be recovered in the first crop of this recrystallization? (Show calculations) e) How can you prove the purity and identity of the purified Benzoic acid?arrow_forward
- Briefly describe the principles for separating the components of a mixture by solvent extraction.arrow_forwardDraw an outline of the recrystallization process- Assume all types of Impurities(Soluble, Insoluble and colored) are present.arrow_forwardWeigh out 5g of table salt. Dissolve it in 50mL of distilled water in a container using a stirrer and label appropriately. Calculate the concentration in terms of percent mass per volume.arrow_forward
- What characteristics must a substance possess for it to be separated from a heterogeneous mixture by steam distillation?arrow_forwardWhat will happen if the recrystallization mixture is cooled very quickly so that crystals form very rapidly? small pure crystals will form the impurities will stay in solution small impure crystals will form O large impure crystals will formarrow_forwardBriefly explain why crystals form as the solvent cools during recrystallization.arrow_forward
- Give a fundamental description of the recrystallization process. Explain why it is required and how it can be executed.arrow_forwardUsing recrystallization techniques, a student attempts to purify 0.50 g of compound H. Based on the solubility of H in the chosen solvent at collection temperature, the maximum percent recovery is 82%. The student obtains 0.396 g of purified crystals. What is their percent recovery? Group of answer choices 41% 64% 79% 82% 97% none of thesearrow_forwardWhat is another factor that can influence fractional distillation’s success other than the number of theoretical plates?arrow_forward
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