A drop of water is poured over a white powdery substance. Then it is observed that the substances turn blue. Answer the following questions: (i) What is the powdery substance (ii) Why does the substance change color (iii) What is the chemical formulae of the blue substances (iv) Is the blue substance an acidic or a basic salt (v) Give reason for your answer in (iv)
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i. Anhydrous copper sulphate CuSO4
ii. when water is added to copper sulphate it was converted into copper sulphate pentahydrate which is crystalline substance of blue colour.
iii. CuSO4.5H2O
iv. it is a neutral crystalline salt.
v. as it does not have any ionisable H+ or OH- radical.
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