Question

Why hydration energey of Ai3+ is three times greatee then ca3+

Answer 1

Now Al3+ and Mg2+ are nearly same in size. But the charge density on Al3+ is more than Mg2+ due to +3 charge on Al compared to +2 charge on Mg. Hence, hydration energy of Al3+ is more than Mg2+

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Answer 2

Answer:

al3+ has the larger hydration energy, because hydration energy increases with the charge on the cation and decreases as the size of the cation increases