……. copper sulfate is used for testing water.

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Solution

Copper sulfate:
Copper sulfate is a standard sulfate that is white in anhydrous form and blue crystal in hydrated form is commonly involves eliminating algae and fungicide.
The number of water molecules present in a crystal is called water of crystallization.
In hydrated copper sulfate, there are five water molecules.
Heating of hydrated copper sulfate.
Due to heating, hydrated blue-colored copper sulfate $({CuSO}_{4} . 5 H_{2} O)$ loses water and turns into anhydrous white-colored copper sulfate $({CuSO}_{4})$ .
Thus Anhydrous copper sulfate is used for testing water.

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