Why Does Mixing CuSO4 and H2O Release Heat?

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Mixing CuSO4 with water releases heat due to the dissociation of copper and sulfate ions, which is an exothermic reaction. However, when CuSO4.5H2O is mixed with water, significant heat is not produced. The heat of hydration plays a crucial role in this process, as it accounts for the energy changes when ions interact with water molecules. Understanding these thermodynamic principles is essential for explaining the heat release in the reaction. The discussion highlights the complexity of hydration and energy release in chemical reactions.
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Mixing CuSO_4 and H_2O, heat was produced during the reaction. Why did that happen?
 
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the simplest answer is that when the cupper and sulfate ions dissociated energy was released.
 
The simplest answer is slightly wrong here, as if you will mix CuSO4.5H2O with water you will not observe substantial heat evolving.

Look for heat of hydration.
 

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