Question

Justify the following statements with an explanation. 

1. The solubility of calcium oxide decreases with increase in temperature, 

2. What happens to the solubility in the exothermic process with regard to temperature? 

3. In the endothermic process, solubility increases with increase in temperature. 

4. At a given temperature, an increase in pressure increases the solubility of the gas

Answer 1

1. In an exothermic process, the solubility decreases. When calcium oxide dissolves in water, an exothermic reaction takes place, and so the solubility of calcium oxide decreases 

2. In an exothermic process, the solubility decreases with the increase in temperature, as there is already an evolution of heat and it is observed. 

3. In an endothermic process, the solubility increases. The solubility of KNO₃ in water is an endothermic reaction and so solubility increases with the increase of temperature. 

4. At a given temperature, an increase in pressure increases the solubility of gas according to Henry’s law. e.g. (CO₂ in soft drinks)