Number 10 & 12 please!! If you were going to carry out a recrystallization of be

Question

Number 10 & 12 please!! If you were going to carry out a recrystallization of benzoic acid and the following solvents were available, which would be your best choice of solvent to use for this recrystallization? This table lists the solubility of benzoic acid per 100 grams of solvent at 20 degree C and 80 degree C and the boiling point of the solvent. A) Solvent A B) Solvent B C) Solvent C D) Solvent D A student has 1.00 g of a crude product that exhibits a melting point of 121 5-122 0 degree C. After recrystallization 0.50 g of purified product are recovered with a melting point of 121 5-121 9 degree C. Which is the best interpretation of these results? A) The original product was pure, and some of it remained in the solvent when crystallizing. B) The original product was impure, and the impurity weighed 0.5g. C) More solvent needs to be removed from the purified product. D) The original material was impure and the recovered material still contains impurities. If you are purifying a 1.00 g sample which is contaminated by 20 wt % of an impurity, what is the maximum amount in grams of a pure sample you could recover? A) 1.20 g B) 0.20g C) 0.80 g D) 1.00 g

Explanation / Answer

For recrystallizatoin process, solute should be less soluble in solvent at lower temperature and maximum solubility at higher temperature. So, the solvent has higher boiling point.

So, the solvent A is better solvent for recrystallization.

Answer: A) solvent A.

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