CuSO4 (s) + 5H2O (l) → CuSO4.5H2O (s)
Copper sulfate turns a light blue colour in the presence of water
A lot of students are tempted to say you can identify water because it has no taste or smell. While this may be true, it would be extremely hazardous to taste anything in the lab and water is not the only colourless liquid to have no taste or smell!
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