1.

How will you prepare nitric acid?

Answer»

Nitric acid is prepared by heating equal amounts of potassium or sodium nitrate with concentrated sulphuric acid.

KNO3 + H2SO4 → KHSO4 + HNO3 

The temperature is kept as low as possible to avoid decomposition of nitric acid. The acid condenses to a fuming liquids which is coloured brown by the presence of a little nitrogen dioxide which is formed due to the decomposition of nitric acid. 

4HNO3 → 4NO2 + 2H2O + O2



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