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ICSE Class 10 Answered

Can you pls explain ostwal process
Asked by Sona | 12 Mar, 2018, 07:21: PM
answered-by-expert Expert Answer

Manufacture of Nitric Acid

In 1914, a German chemist Ostwald developed the Ostwald process to manufacture nitric acid.

 

Step 1: Catalytic oxidation of Ammonia

A mixture of dry air and dry ammonia in the ratio of 10:1 by volume is compressed and then

passed into a platinum gauze which acts as catalyst at about 800°C.

4NH3 + 5O2 4NO +6H2O +Heat

 

Step 2: Oxidation of nitric oxide

Nitric oxide combines with oxygen to form nitrogen dioxide at about 50°C.

2NO +O2 2NO2

 

Step 3: Absorption of nitrogen dioxide in water

The nitrogen dioxide and oxygen present in the air react with water to form nitric acid.

4NO2 +2H2O +O2 → 4HNO3

 

Nitric acid obtained is concentrated above 50%. On further distillation, 68% nitric acid is produced.

 

 

 

Answered by Varsha | 13 Mar, 2018, 10:15: AM

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