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What is the ionic reason for fading of the blue colour of copper sulphate solution?

Answer and explanation

Correct answer: The concentration of copper(II) ions, \(\mathrm{Cu^{2+}}\), decreases

The blue colour of aqueous copper sulphate solution is mainly due to hydrated copper(II) ions, \(\mathrm{Cu^{2+}}\). When the concentration of these ions decreases, the blue colour becomes less intense and the solution appears paler. Sulphate ions, \(\mathrm{SO_4^{2-}}\), do not cause the blue colour, so option B is not the correct ionic reason. Exam tip: For solution colour changes, first identify the ion responsible for the colour.

Related tags

Class 10 ScienceChemical ReactionsCopper SulphateCopper(Ii) IonsColour ChangeIonic Concentration

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