Which color change indicates water when using anhydrous copper sulfate?

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Multiple Choice

Which color change indicates water when using anhydrous copper sulfate?

Explanation:
Hydration changes copper sulfate’s color. The anhydrous form of copper sulfate is white. When it absorbs water, it becomes copper sulfate pentahydrate (CuSO4·5H2O), which is bright blue. So seeing blue indicates water has been added or is present. If it stays white, there’s no water. Pink or green colors don’t result from this hydration process in standard tests, so they don’t indicate water for this substance.

Hydration changes copper sulfate’s color. The anhydrous form of copper sulfate is white. When it absorbs water, it becomes copper sulfate pentahydrate (CuSO4·5H2O), which is bright blue. So seeing blue indicates water has been added or is present. If it stays white, there’s no water. Pink or green colors don’t result from this hydration process in standard tests, so they don’t indicate water for this substance.

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