why does not distilled water conduct electricity whereas rainwater does?
Answers
Distilled water is a very weak electrolyte and does not dissociate into ions. Therefore, it does not conduct electricity. However, rain water contains some dissolved acids like carbonic acid and sulphurous acid. Actually air contains dresses of both carbon dioxide and sulphur dioxide gases. As a result, water becomes acidulated and gets ionized ionised easily. Therefore, rain water conducts electricity.
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Distilled water does not conduct electricity because it does not contain any ionic compound (like acids, bases or salts) dissolved in it.
Rainwater, while falling to the earth through the atmosphere, dissolves an acidic gas carbon dioxide from the air and forms carbonic acid (H2CO3). Carbonic acid provides hydrogen ions, H+ (aq) and carbonate ions, CO(aq)32to rainwater. Hence, due to the presence of carbonic acid which provides ions to rainwater, the rainwater conducts electricity.