Question

nitrogen preparation ​

Answer 1

Answer:

Nitrogen is produced commercially almost exclusively from air, most commonly by the fractional distillation of liquid air. Nitrogen gas escaping from the liquid air is then captured, cooled, and then liquefied once more.

Explanation:

To prepare pure nitrogen in the laboratory, a mixture of ammonium chloride (NH4Cl) and sodium nitrite (NaNO2) is heated. The first product that is formed is ammonium nitrite (NH4NO2). This compound is very unstable, and breaks up into nitrogen and water.

Commercial production of nitrogen is largely by fractional distillation of liquefied air. The boiling temperature of nitrogen is −195.8 °C (−320.4 °F), about 13 °C (−23 °F) below that of oxygen, which is therefore left behind.