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Question

Solid copper sulphate does not conduct electricity, but when it is dissolved in water, it does conduct electricity. Why?

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Solution

One of the essential requirements for conducting electricity is the presence of free electrons or ions. In its solid state, the ions of copper sulphate (ionic compound) are immobile; therefore, it cannot conduct electricity. But when it is dissolved in water, it dissociates into copper ions and sulphate ions. These dissociated ions of copper sulphate conduct electricity.

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