6. A certain amount of solvent A\' will dissolve 32 grams of acetaminophen (Tyle

Question

6. A certain amount of solvent A' will dissolve 32 grams of acetaminophen (Tylenol) at room temperature and 35 grams at 100°C. The same amount of 'solvent B' will dissolve 1.2 grams of acetaminophen at room temperature and 35 grams at 100°C. Which one of these two solvents will be suitable for the recrystallization of acetaminophen?_ Explain your reasoning. 7. Aliterof boiling water will dissolve 97.5 grams of a certain compound. At room temperature, only 2.3 grams of the compound will dissolve in a liter of water. When a student dissolves 65.8 grams of the compound in a liter of boiling water and lets it cool to room temperature, what will be the mass (grams) of the crystals that form? Show your calculation.

Explanation / Answer

Solvent B will be the best choice for recrystallization of acetaminophen because acetaminophen is poorly soluble at room temperature and very soluble at 100-degree Celsius. The good solvent for the recrystallization is the one where the compound is very poorly soluble when the solvent is cold and almost soluble when the solvent is hot and solvent B fits both these criteria.

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