Question

Determine whether each of the following solutions will be saturated or unsaturated at 20 degrees C:

a. adding 25 g of KCl to 50 g of H2O

b. adding 150 g of NaNO3 to 75 g of H2O

c. adding 80 g of sugar to 25 g of H2O.

Answer 1

a. Solubility of KCl is 34g per 100 g water or 17 g per 50 g water. Since we are adding more than 17 g KCl, so the solution will be saturated.

b. Solubility is 87.6 g per 100 g water, which is less than the amount we are adding. Thus solution will be saturated.

c. Solubility of sugar is around 204 g per 100 g water, that comes out to be 51 g sugar per 25 g water.But we are adding 80 g sugar in 25 g water, which is more than the solubility.Thus the solution will be saturated.

Comment in case of any doubt.