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Why should the recrystallization mixture be cooled in an ice bath prior to filtering?
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- List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillationGive a fundamental description of the recrystallization process. Explain why it is required and how it can be executed.Draw an outline of the recrystallization process- Assume all types of Impurities(Soluble, Insoluble and colored) are present.
- Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?Briefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.Briefly explain the principles involved in the separation of the components of a mixture by solvent extraction.
- Why do two layers form when solutions containing water are added to the extracted dichloromethane (CH2CI-2) solution?Q1. 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?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.