At a distance of about 1 cm we place a drop of hydrochloric acid and a drop of ammonia. White cloud forms and after a few second white crystals appear around the drop of acid.
drops of ammonia and hydrochloric acid gas molecules escape. NH3 molecules are lighter and spread more rapidly than the molecules of HCl. These two substances react together and form the white cloud of ammonium chloride which forms white crystals around the drop of acid.
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