Why does distilled water not conduct electricity, whereas rain water does ?


Answer :

For conduction of electricity free ions is needed to carry the charge from one end to another.pH value of water is 7 which states that it is neither acid nor base,it is neutral and does not contain free ion to carry charge.
Distilled water cannot conduct electricity because it does not contain ions while rain water conducts electricity as it contains ions due presence of dissolved salts in it. Distilled water which is a pure form of water, is neither acidic nor basic in nature. So distilled water does not dissociate into ions. Since, conduction of electricity requires free ions so, distilled water does not conduct electricity.Distilled water cannot conduct electricity because it does not contain ions while rain water conducts electricity as it contains ions due presence of dissolved salts in it. Distilled water which is a pure form of water, is neither acidic nor basic in nature. So distilled water does not dissociate into ions. Since, conduction of electricity requires free ions so, distilled water does not conduct electricity.
Rain water being an impure form of water, contains many ionic species. These ions are responsible for electrical conductivity of rain water.

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