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Suppose you obtain 0.500 g of a compound after synthesis with the following solubility: In ethanol 4.24g/100 mL at 78 ⁰C and 0.30g/100 mL at 0 ⁰C. Performing recrystallization to purify the compound using 10 mL of ethanol, what would you expect the theoretical yield from the experiment to be? Show your calculations. (6 points)

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Answer:

0.394g

Explanation:

At 78°C, you can dissolve, in 10mL of ethanol, 0.424g of the compound will dissolve. Then, you must filter the solution.

You take the filtrate of the solution in ethanol and cool it to 0°C. Om mL, only 0.03g of the compound will remain in solution. The other part is the purified compound.

Its mass (Theoretical yield) is:

0.424g - 0.030g =

0.394g

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