Nitric Acid HNO3

Manufacturing Nitric Acid
The process is called the OSTWALD PROCESS.
It involves three steps.

Step 1
Ammonia is:

4NH3 + 5O2 → 4NO + 6H2O

Step 2
Nitrogen monoxide is oxidised into nitrogen dioxide
2NO + O2 → 2NO2

Step 3
Nitrogen dioxide is absorbed in water, forming nitric acid.
3NO2 + H2O → 2HNO3 + NO


The overall reaction is :
NH3 + 2O2 → HNO3 + H2O

Some Uses of HNO3
The nitric acid is used to make:

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