Question

What is the mass of KNO3(s) that must dissolve in 100. grams of water to form a saturated solution at 50.oC?

Answer 1

First, you need to check the solubility of salt table to get the solubility of KNO3(s) at 50℃. The solubility is 84g/100g which means you need 84 g KNO3 dissolving in 100 g water to make saturated solution.

Answer 2

The solubility of substance depends upon the temperature. In present case, the solubility of KCl is 84g/100g at 50.oC.

This means that, maximum 84g of KCl can be dissolved in 100g of water (at 50.oC) to form solution. This solution is referred as saturated solution.

Thus, 84g of KNO3 must be dissolve in 100 grams of water to form a saturated solution at 50 oC.