Question

The solubility of potassium chloride (KCl) and Hydrogen chloride (HCl) for different temperatures is given in the table below:

Temperature (degree celsius)	10	20	30	40	50	80
Solubility (g per 100 ml), KCl	31.2	34.2	37.2	40.1	42.6	51.5
Solubility (g per 100 ml), HCl	75	70	65.5	61	57.5	51.5

At what temperature, both substances have the same solubility
?

• A. ${10}^{\circ }C$
• B. ${30}^{\circ }C$
• C. ${50}^{\circ }C$
• D. ${80}^{\circ }C$

Answer 1

The correct option is D

${80}^{\circ }C$

From the given data in the table, at ${80}^{\circ }C$, the solubility of HCl and KCl is same, which is 51.5 g/mL.