the anhydrous salt which turns blue on addition of water
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copper(II) sulfate
It is also known as anhydrous copper(II) sulfate because it has no water in it. When water is present in a sample of copper(II) sulfate it turns blue. It is still a dry solid, because the individual water molecules are trapped within the ionic lattice surrounding the copper(II) ions.
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major reference. Cupric sulfate is a salt formed by treating cupric oxide with sulfuric acid. It forms as large, bright blue crystals containing five molecules of water (CuSO4∙5H2O) and is known in commerce as blue vitriol. The anhydrous salt is produced by heating the hydrate to 150…
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