What are the limitations of recrystallization as a purification/isolation technique? Briefly describe two distinct situations in which recrystallization would not be a useful way to purify a compound.
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What are the limitations of recrystallization as a purification/isolation technique? Briefly describe two distinct situations in which recrystallization would not be a useful way to purify a compound.
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- Describe the differences between a Stober procedure and a water/oil emulsion procedure for the synthesis of colloidal silica particles.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?List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillation
- What is the minimum distribution constant that permits removal of 99% of a solute from 50.0 mL of water with two 25.0-mL extractions with toluene? five 10.0-mL extractions with toluene?Which statement about the determination of the percentage purity of benzoic acid is correct? * A- Only sodium hydroxide solution can be used as the titrant in the volumetric analysis of benzoic acid. B- Analysing a benzoic acid sample that still contains some hydrochloric acid may yield an analyte percentage that is less than expected. C- Analysing a wet benzoic acid sample may yield an analyte percentage that is more than expected. D- All these statements are correct. E- None of these statements are correct.Students were tasked to conduct a recrystallization experiment to test the ability of the newly discovered solvents in their laboratory to purify and separate a mixture containing compounds X and Y. The solubility of the two compounds in g/50 mL of hot and cold solvents are given by the photo.
- Give a fundamental description of the recrystallization process. Explain why it is required and how it can be executed.In general describe how a mixed solvent recrystalization works.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.