Discuss the Commercial method to prepare Nitric acid. (Or) How will

1.	Discuss the Commercial method to prepare Nitric acid. (Or) How will you prepare nitric acid by Ostwald’s process?
Answer» Nitric acid prepared in large scales using Ostwald’s process. In this method ammonia from Haber’s process is mixed about 10 times of air. This mixture is preheated and passed into the catalyst chamber where they come in contact with platinum gauze. The temperature rises to about 1275 K and the metallic gauze brings about the rapid catalytic oxidation of ammonia resulting in the formation of NO, which then oxidised to nitrogen dioxide. 4NH₃ + 5O₂ → 4NO + 6H₃O + 120kJ 2NO + O₂ → 2NO₃ The nitrogen dioxide produced is passed through a series of adsorption towers. It reacts with water to give nitric acid. Nitric acid formed is bleached by blowing air. 6NO₂ + 3H₂O → 4HNO₃ + 2NO + H₂O

Discuss the Commercial method to prepare Nitric acid. (Or) How will you prepare nitric acid by Ostwald’s process?

Answer»

Nitric acid prepared in large scales using Ostwald’s process. In this method ammonia from Haber’s process is mixed about 10 times of air. This mixture is preheated and passed into the catalyst chamber where they come in contact with platinum gauze. The temperature rises to about 1275 K and the metallic gauze brings about the rapid catalytic oxidation of ammonia resulting in the formation of NO, which then oxidised to nitrogen dioxide.

4NH₃ + 5O₂ → 4NO + 6H₃O + 120kJ

2NO + O₂ → 2NO₃

The nitrogen dioxide produced is passed through a series of adsorption towers. It reacts with water to give nitric acid. Nitric acid formed is bleached by blowing air.

6NO₂ + 3H₂O → 4HNO₃ + 2NO + H₂O

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