Heat of Hydration of Na+ (size 102 pm) = -397 kJ mol-1 whereas Caz 100 pm) = -1650 kJ mol-1. Explain the difference.

Heat of Hydration of Na+ (size 102 pm) = -397 kJ mol-1 whereas Caz 100

1.	Heat of Hydration of Na+ (size 102 pm) = -397 kJ mol-1 whereas Caz 100 pm) = -1650 kJ mol-1. Explain the difference.
Answer» Ca²⁺ is smaller in size than Na⁺ and also it has higher charge, therefore, its hydration energy is more than that of Na⁺.