Why is the dissolution of anhydrous copper sulfate exothermic, and the dehydration of $CuSO_4*5H_2O$ endothermic?

Md Ariful Islam

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Md Ariful Islam

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And, clearly, bond making reactions are exothermic.

For hydration of anhydrous copper sulfate:

$CuSO_4(s) + "excess water"$ $H_2O(l) rarr Cu^(2+)(aq) + SO_4^(2-)(aq)$

And this is clearly a chemical reaction, right down to the visible colour change observed. $Cu^(2+)(aq)$ is a coordination complex, that is probably $[Cu(OH_2)_6]^(2+)$.

On the other hand, when we take the blue hydrate, $CuSO_4*5H_2O$ and place it in water, strong ionic bonds between the sulfate and copper ions must be broken for dissolution.

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