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Fading of blue colour of copper sulphate solution is linked with decrease of which ion?

Answer and explanation

Correct answer: Copper(II) ion

The blue colour of aqueous copper sulphate is mainly due to hydrated copper(II) ions, \(\mathrm{Cu^{2+}}\). When these ions are converted into copper metal during a reaction, their concentration in the solution decreases and the blue colour fades. Iron(II) ions may form and change the solution’s appearance, but the direct reason for loss of blue colour is the decrease in \(\mathrm{Cu^{2+}}\) ions. Exam tip: Link the colour of a solution with the metal ion responsible for it.

Related tags

Class 10 ScienceChemical ReactionsCopper SulphateCopper(Ii) IonDisplacement ReactionColour Change

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