Chemistry

19.08.2022 21:28

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the solubility of acetanilide is 12.8 g in 100 ml of ethanol at 0 ∘c, and 46.4 g

the solubility of acetanilide is 12.8 g in 100 ml of ethanol at 0 ∘c, and 46.4 g in 100 ml of ethanol at 60 ∘c. what is the maximum percent recovery that can be achieved for the recrystallization of acetanilide from ethanol?

a student was given a sample of crude acetanilide to recrystallize. the initial mass of the the crude acetanilide was 171 mg.the mass after recrystallization was 125 mg.

calculate the percent recovery from recrystallization.

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akeemsimpson15p2034o

4,5(67 marks)

72.41% and 26.90% respectively.

Explanation:

At 60°C, you can dissolve 46.4g of acetanilide in 100mL of ethanol. If you lower the temperature, at 0°C, you can dissolve just 12.8g, which means (46.4g-12.8g)=33.6g of acetanilide must have precipitated from the solution.

We can calculate recovery as:

$\%R=\frac{crystalized\ mass}{initial\ mass}*100 =\frac{33.6\ g}{46.4\ g}*100=72.41\%$

So the answer to the first question is 72.41%.

For the second part just use the same formula, the mass of the precipitate is the final mass minus the initial mass, (171mg-125mg)=46mg.

$\%R=\frac{crystalized\ mass}{initial\ mass}*100 =\frac{46\ mg}{171\ mg}*100=26.90\%$

So the answer to the second question is 26.90%.

blancademarco1994

4,8(60 marks)

I think the answer is b! :)

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