Question

why nitric acid is kept in a reagent bottle for long time?​

Answer 1

Answer:

Nitric acid stored in a bottle turns yellow. This colour is due to dissolved NO2 in HNO3. To avoid decomposition, nitric acid is normally stored in coloured bottles.

Explanation:

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Answer 2

Explanation:

Nitric acid takes yellowish brown colour due to the presence of dissolved nitrogen dioxide.

Nitric acid slowly decomposes even at room temperature, specially in the presence of sunlight.

4HNO3→4NO 2+2H2O+O2

Liberated nitrogen dioxide dissolves in the acid and gives a yellow colour.

Brown vapours are seen in the bottle and the nitric acid turns yellowish in colour.