Question

salt water is good conductor of electricity whereas distilled water does not conduct electricity why

Answer 1

salt is an electrolytic ionic compound
water is a polar non ionic hydrogen bonded covalent compound

Answer 2

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Distilled water is water that was boiled to steam and recondensed to water. So distilled water is relatively pure H2O. Water can ionize to H+ and OH- like salt does, but it ionizes to a far lesser degree and is very resistant to conducting electricity.