Tap water is such a solution. That is why you MUST NOT touch electrical outlets or switches with wet hands. Water doesn’t need to have a large amount of impurities to act as a good conductor of … Deionised water, however, as well as nearly all types of purified water products, is not a good conductor because of its lack of salts. Tap water, which hasn’t been purified, is very conductive because it contains a lot of dissolved salts. In tap water, rainwater and seawater, there are countless impurities, such as sodium (Na+), calcium (Ca2+), and magnesium (Mg2+) ions (source). Because the electrical current is transported by the ions in solution, the … But not all impurities can do so, only those that can contribute ions, such as salt. Because these are charged, when they are present in water, electricity is able to flow through the liquid. Most water we come into contact with, such as tap water or not completely distilled bottle water, contain impurities that turn water into a conductor. Why is normal water a good conductor of electricity? Water conductivity Pure water is not a good conductor of electricity. Ordinary distilled water in equilibrium with carbon dioxide of the air has a conductivity of about 10 x 10 -6 W -1 *m -1 (20 dS/m).

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