Question

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

Answer 1

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.