Question

Which among the following salts, solubility decreases with increase in temperature?

Options

• Na₂SO₄

• NaBr

• NaCl

• KCI

Answer 1

Na₂SO₄ 

Explanation:

For Na₂SO₄ salt, solubility decreases with increase in temperature because reaction of Na₂SO₄ with water is an exothermic reaction, i.e. `Delta_"sol"` H < 0. As a result solubility decreases. For NaBr, NaCl and KCI, the dissolution process is endothermic.