How will you prove experimentally that tap water contains dissolved impurities? Draw the diagram of the apparatus used.

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Solution

Experiment:
Aim: To show that tap water contains dissolved impurities.
Apparatus required: Beaker, watch glass, wire gauge, burner, tripod stand
Procedure:
Put some tap water on a clean watch glass, and place it over a beaker containing water.
Boil water in the beaker.
When all the water has evaporated from the watch glass, remove it from the burner and let it cool.
Observation:
On looking at the watch glass against light, a number of concentric rings of solid matter are seen.
These are the dissolved impurities left behind after the evaporation of water.

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