Question

d. A deep blue copper sulphate solution turns pale blue when water is added.
Name and describe the phenomenon that causes the change in colour from deep
blue to pale blue.
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Answer 1

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

Answer 2

Answer:

When you add CuSO4 to water it ionizes into its respective ions ( Cu+ and SO4-) and the Cu+ ion has a blue~ish colour. This is what causes the blue hue.

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