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What is the purpose of recrystallization? At room temperature what types of solid organic compounds are soluble in water, insoluble? Give specific examples of each with structures. Why is gravity unnecessary in this experiment? You have allowed your solution to cool in an ice bath, and no crystals have formed. Assuming the solution is supersaturated, what can you do to get the crystals out of solution at this point? The solubility of a compound is 8.4 g per 100 mL in boiling water, 1.9 g per 100 mL in cold water, whereas its solubility in ethanol is 13.8 g per 100 mL at 78 degree C and 4.2 g per 100 mL at 2 degree C. Which solvent would be better for the recrystallization of the compound? Explain.
Expert Answer
Answer
1) To extract the pure compound from Impure compound
2) Salt type of organic compounds are soluble in cool water Cl– +NH3-CH2-COOH and Pyridinium chloride
3) —-
4) By removing the some amount of solvent from the soluble solution.(minimize the solution by removing solvent) and put the solution in cooling
5) In this case Water is the best solvent for recrystalization because compound is low soluble in cooling condition and avarage soluble in hot condition. (For recrystalization the solvent should have low solubility in cool condition and avarage solubility in hot condition that is ideal solvent for recrystalization)
