Why hydration energy of Al is three times greater than ca
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Hydration energy depends upon charge density (Charge/size). As Al+3 charge is greater than Mg+2 so it's charge density is greater than Mg+2, that's why hydration energy of Al+3 ion is greater than Mg+2.
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The higher the charge density the higher will be the force of attraction between the ion and the water polar end. This makes the value of hydration enthalpy higher in smaller ions. The Al^3+ is smaller in size than Ca^2+ and the charge density of Al^3+ is greater than that of Ca^2+.
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