Question

A blue colour salt becomes white on heating.give reason for the above observation. What happens when we add water to the salt which is obtained after heating? Also write it's formula

Answer 1

HEYA!
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THE BLUE COLORED SALT IS HYDRATED COPPER SULPHATE.

❇FORMULA : CuSO4.5H2O

⭐There are 5 molecules of water of crystallization attached .

⭐It is also called Blue Vitriol .



✔It becomes white on heating as it loses the water of crystallization attached and becomes anhydrous copper sulphate .

✔When you again add water , it again retains its blue color ..


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Answer 2

HEY mate here is your answer.

The blue colour salt is copper sulphate which is in the form of water crystallization I.e. the salt has some water in it but when we heat it the water part evaporate and only copper sulphate is left out which is white in colour.

CuSO4.5H2O------heat----»CuSO4+5H2O

when we add water to the salt the salt dissolves in the water.

Hope it helps you.

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