Suppose that 11.00 g of compound X (solubility 1.0 g/100 mL at 0°C) is contamina

Question

Suppose that 11.00 g of compound X (solubility 1.0 g/100 mL at 0°C) is contaminated with 1.00 g of compound Y (solubility 1.1 g/100 mL at 0°C)and 1.00 g of compound Z (solubility 1.5 g/100 mL at 0°C). The impure mixture is recrystallized from 70 mL of solvent, cooled to 0°C and filtered. (The collected crystals are called a crop.)

Showing your calculations, answer below:

a. What is the composition (grams of X, Y, and Z) of first crop of crystals?

b. What is the percentage of X in the first crop?

c. Has the purity of compound X in the first crop improved over that in the original mixture?

Explanation / Answer

Suppose that 11.00 g of compound X (solubility 1.0 g/100 mL at 0°C) is contamina

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