Question

Explain why, distilled water doesn't conduct electricity. What substance can be added to distilled water in small to make it a good conduct electricity​?

Answer 1

Distilled water does not contain any minerals so distilled water does not conduct electricity
, even if you add a little bit of salt the water would be able to conduct electricity.

Answer 2

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Dissolve a pinch of common salt in distilled water. When salt is dissolved in distilled water we get salt solution. By passing current through it ,we will find that the magnetic needle of compass shows deflection. Thus, distilled water becomes a good conductor of electricity on dissolving a little of salt in it.