Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Explanation

When a saturated solution of potassium chloride at 353 K is cooled, the solubility of potassium chloride in water decreases. As a result the amount of potassium chloride which exceeds its solubility at lower temperature separates out as crystals.