In a recrystallization experiment, why is a minimum amount of hot solvent used to dissolve the crude product?
Correct answer: A. To increase the yield of crystals
- A. To increase the yield of crystals
- B. To prevent decomposition of the compound
- C. To ensure rapid cooling
- D. To maximize solubility of impurities
Explanation
Using a minimum amount of hot solvent keeps the solution saturated, maximizing crystal yield upon cooling while impurities remain dissolved.
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About Experimental Techniques in Chemistry
Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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