The chemical equation for the reaction of copper sulfate when heated depends on the temperature and presence of other substances. Here are two possibilities:

1. Dehydration of Copper Sulfate Pentahydrate:

If you heat copper sulfate pentahydrate (CuSO₄·5H₂O), a blue crystalline solid, you will drive off the water molecules, leaving behind anhydrous copper sulfate (CuSO₄), a white powder:

CuSO₄·5H₂O (s) → CuSO₄ (s) + 5H₂O (g)

2. Decomposition of Anhydrous Copper Sulfate:

If you heat anhydrous copper sulfate (CuSO₄) to a much higher temperature, it will decompose into copper(II) oxide (CuO) and sulfur trioxide (SO₃):

2CuSO₄ (s) → 2CuO (s) + 2SO₃ (g)

Important Note: The decomposition of anhydrous copper sulfate typically occurs at temperatures above 650°C, and the reaction is reversible.

Let me know if you have any other questions about this!