Is Nitrogen Dioxide Acidic or Basic or Neutral Gas? | NO2 Acidity

Nitrogen dioxide is an acidic gas and produce an acidic solution in the water (mixture of acids).

Otherwise, we can say, NO2 is one of the strong acidic gas in chemistry.

Nitrogen dioxide is an acidic gas. NO2 dissolves very well in water react with water to give nitrous acid and nitric acid. You can see brown colour of nitrogen dioxide is disappeared when NO2 reacts with water.

This reaction is an oxidizing - reducing reaction and a hydrolysis reaction.

Nitrogen dioxide and water reaction with balanced equation

Nitrous(HNO2) and nitric acids(HNO3) are given as products. HNO2 is a weak acid and HNO3 is a strong acid.

Nitrogen dioxide and water reaction

Oxidation number of nitrogen in NO2 is +4. Oxidation of nitrogen in HNO2 and HNO3 is +3 and +5 respectively.

NO2 is reduced to HNO2 and oxidized to HNO3.

How to get confirmed nitrogen dioxide gas is acidic or basic?

Now, we NO2 is sent to the water. Check pH value of the solution. You can see pH of the solution is under 7 due to producing of HNO3 and HNO2.

Nitrogen dioxide gas properties

  • Toxic gas.
  • Acidic - Dissolves in water very well to form HNO3 and HNO2. When this reaction occurs, brown colour of NO2 is decreased.
  • It is a brown colour

Brown colour NO2 reducing in water, can be used to identify Br2 gas from NO2. Br2 brown colour is not changed much with water. Br2 slightly reacts with water to produce HBr and HOBr. Therefore Br2 brown colour is kept in the water.

Nitrogen dioxide reacts with rain water in the sky to produce acid rain which is a large environmental issue.

Nitrogen dioxide and water reaction pH

Nitrogen dioxide will give nitric acid and nitrous acid in water. Aqueous nitric acid solution shows pH value under 7. If lot of nitrogen dioxide dissolve in water, pH alue can be very low such as 1,2,3 giving strong acidic solution.

why Carbon monoxide and nitric oxide are neutral oxides?

Oxidation numbers of carbon and nitrogen atoms in carbon monoxide and nitric oxide are +2 and +2 respectively. When oxidation number is high in oxides of an element, acidic properties increases.

Related Tutorials

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