what do you observe when:
(i) when water vapours reacts with cobalt chloride.
(ii) Ammonia gas is passed through Nessler’s reagent.
(iii) efflorescent substances are kept at higher temperature.
(iv) Distilled water has no taste.
(v) Addition of dilute hydrochloric acid to silver nitrate.
Answers
I) When water reacts with Cobalt chloride ,cobalt chloride dihydride is formed which is purple in colour.
II)Nesslers reagent on being passed through a solution of ammonia, it gives a dirty brown precipitate.
The product formed is brown in colour and is used in test for ammonium ion.
III) Efflorescencent substances have water associated with it's molecules . When they are kept at high temperature they can loose their water through evaporation .
IV)Distilled water by boiling water and then condensing the collected steam back into a liquid.
Due to this all the minerals present in water are removed and so the distilled water is tasteless.
V)Addition of silver nitrate to hydrochloric acid, gives an insoluble precipitate of the respective chloride.
This precipitate is soluble in ammonium hydroxide and insoluble in dilute nitric acid.