Question

Normally, the solubility of a crystalline solid increases with temperature. Does increase uniformly in all cases ? Name a substance whose solubility.

(a) increases rapidly with temperature.

(b) increases gradually with temperature.

(c) increases slightly with temperature.

(d) initially increase than decreases with a rise in temperature.

Answer 1

Normally, the solubility of a crystalline solid increases with temperature.

• But is not true for all cases.

A substance whose solubility increases rapidly with temperature:

• Potassium nitrate(KNO₃) is a substance whose solubility increases rapidly with an increase in temperature.

A substance whose solubility increases gradually with temperature:

• Potassium chloride(KCl) is a substance whose solubility increases gradually with an increase in temperature.

A substance whose solubility increases slightly with temperature:

• Sodium chloride(NaCl) is a substance whose solubility increases slightly with an increase in temperature.

A substance whose solubility increases then decreases with a rise in temperature:

• Glauber salt(Na₂SO₄.10H₂O) is a substance whose solubility increases and then decreases with a rise in temperature.