The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B present in it is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. (i) identify A,B,C,D. (ii) write the chemical equation involved. (iii) Give an example of salt which also shows above property.
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The metal salt A is hydrated copper sulphate. Substance B is 10 molecules of water of crystallisation. C is anhydrous copper sulphate. D is water. 1. On heating hydrated copper sulphate.... CuSO4.5H2O + heat = CuSO4+ 5H2O 2. Recrystallization of anhydrous copper sulphate CuSO4+ 5H2O= CuSO4.5H2O Another salt which shows such property is hydrated ferrous sulphate crystals (FeSO4.7H2O)
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