Question

# What change in color is observed when copper sulfate is heated? Is it a chemical change or a physical one?

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Hint: A chemical change is a change that includes formation or breakage of chemical bond, while a physical change is just change in physical state of a compound. Copper sulfate has water of crystallization in its crystal structure.

> Copper sulfate that we normally see in a lab is blue in color and it is called hydrated copper sulfate. It contains water molecules in its crystal structure. Its molecular formula can be given as $CuS{O_4} \cdot 5{H_2}O$.
$CuS{O_4} \cdot 5{H_2}O \to CuS{O_4}$
Note: Remember that copper sulfate that we use normally or we use in a lab is hydrate copper sulfate and its chemical formula is $CuS{O_4} \cdot 5{H_2}O$. Whenever we take or calculate the molecular weight of this compound, the weight of water molecules are also considered.