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Why does distilled water not conduct ele...

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

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Pure water (or distilled water) is a very weak electrolyte and does not dissociater into ions. Therefore it does not conduct electricity. However, rain water contains some dissolved acids like corbonic acid `(H_(2)CO_(3))` and sulphurous acid `(H_(2)SO_(3)).` Actually air contains traces of both `CO_(2)and SO_(2)` gases which dissolve in rain water to produce these acids. As a result, water becomes acidulated and gets ionised easily. Therefore, rain water conducts electricity.
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