Question

Blue coloured solution is given in the figure. Which solution is it? What causes the

colour change in this solution. Explain.​

Answer 1

Explanation:

blue solution is copper sulphate which has water of crystallization

formula is. CuSO4. 5 H20

iron is more reactive then copper

hence it displaces copper from copper sulphate solution and forms iron sulphate

formula is. Feso4 which is pale green in colour

it is a displacement reaction

Fe + CuSO4 ------> FeSO4 + Cu

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Answer 2

The given blue-colored solution is that of hydrated copper sulphate.

• The solution of CuSO₄.5H₂O is blue in color.
• So, the solution contained in the beaker is that of copper sulphate.

Change in color of the solution occurs due to the following:-  

• Iron, being more reactive than copper, will displace it.
• Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)
• The copper sulphate so formed gives greenish color.
• Hence, it is an example of a displacement reaction.