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Question

Which has more hydration energy? MgSO4 or BaSO4


A

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B

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C

Same

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D

Data insufficient

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Solution

The correct option is A


Hhyd = k1r+ + k2r

observe that SO42 is a very big anion r+ << r

Thus,hydration enthalpy α 1cation size

MgSO4 has more hydration energy.

In cases where r+ << r lattice energy will not decreases rapidly with increases in cation size.But hydration energy will decrease rapdily with increasing cation size.

For solubility, hydration enthalpy > lattice energy.

MgSO4 is more soluble than BaSO4


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