Solubility data for compound A 223 g/500 mL of water at 100oC 75.1 g/500 mL of w

Question

Solubility data for compound A 223 g/500 mL of water at 100oC

75.1 g/500 mL of water at 5oC

2)What is the minimum volume of water required to recrystallize a 431 g sample of A?Please carry maximum number of significant figures through to final answer then round to a whole number. Do not include units.

3)Assuming a student used 2125 mL of water in question 2 what is the maximum percent recovery of A given that the solution was cooled to 5oC? Please carry maximum number of significant figures through to final answer then round to a whole number.

Explanation / Answer

here given

solubilty of compound A At 223 g/500 mL of water at 100oC

and 75.1 g/500 mL of water at 5oC

To calculate the required amount of volume needed to perform the recrystallization, we need to invert our solubility units so that the grams of our compound A and the grams of the solubility term cancel out.

431g A * 223 g/500 mL = 192.22mL to perform recrystallization In 100c

431 x 75.1 g/500 mL = 64.73mL for recrystallization in 50c

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