Question

Happy new year in advance my dear friends.
plz explain an experiment based on the tap water containing dissolved salt.

Answer 1

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tap water contains dissolved salts.
Take a small quantity of tap water in a watch glass. Keep the watch glass on a beaker filled with water. Heat the beaker. The water on watch glass will evaporate on heating. Let it cool for some time. When the watch glass is seen in light, a number of concentric rings of solid matter are seen. These are deposits of dissolved salts left after evaporation of tap water.


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Answer 2

The answer is given