Question

A solid (A) is soluble in water to the extent of 1g per 100ml of water at room temperature and 10g per 100ml of water at the boiling point. How would you obtain pure A from a mixture of 10g of A,1g of impurity B (B has the same solubility in water as A) and 0.1g of impurity C (C is insoluble in water)? How many grams of pure A could be obtained After one recrystallization from water? How much pure A could be obtained, After one recrystallization,from a mixture of 10g of A,9g of B and 8g of C?

Answer 1

You are given a solid (A) that is soluble in water of 1g per 100ml of water at room temperature and 10g per 100ml of water at the boiling point. A is 90.1%.