Nitrous Acid | Uses, Structure, Preparation, Properties |

Nitrous Acid.

Nitrous acid does non be free, only is known alone inwards solution.

Method Of Preparation:

1. "Nitrous acid" tin live on prepared past times the activeness of H2O on N2O3.
   
2. When barium nitrite is treated amongst calculated quantity of dil. H2SO4, hence HNO2 is produced. BaSO4 is precipitated down. Solution of nitrous acid is filtered. Since HNO2 is rattling unstable hence the reaction is carried out at the temperature of freezing mixture.
   

Nitrous Acid Uses.

1. Nitrous acid is used inwards organic chemical scientific discipline for the training of diazo compounds. These compounds are extremely of import inwards organic chemical compound synthesis in addition to training of dyes.
2. It is used equally oxidizing in addition to reducing agent inwards analytical chemistry. 

Nitrous Acid Structure:

Following possible structures has been proposed for HNO2

The construction proposed from the IR written report of Nitrous Acid, is equally below:

Physical Properties Of Nitrous Acid.

1. The aqueous solution of Nitrous acid is pale blue. This blueish coloring is due to the presence of N2O3.
2. It is a weak Acid.
3. It is unstable chemical compound in addition to is decomposed fifty-fifty inwards mutual depression temperature solution.

Chemical Properties of Nitrous Acid.

Decomposition:

It decomposes inwards mutual depression temperature solution in addition to undergoes auto-oxidation

At higher temperature, it decomposes into NO in addition to NO2

As a reducing agent.

Nitrous Acid tin live on oxidized into HNO3 past times certainly other oxidizing agents. Those oxidizing agents supply nascent oxygen to HNO2 to teach inwards HNO3.

Following are about of import reactions, inwards which certainly rigid oxidizing agents are reduced in addition to they tin oxidize HNO2 to HNO3.

Reduction of acidified KMnO4:

Reduction of Br2 in addition to l2:

Reduction of acidified K2Cr2O7:

Reaction amongst alkalies:

HNO2 reacts amongst alkalies to cast nitrites. The nitrites are to a greater extent than frequently than non to a greater extent than stable than HNO2.

Reaction amongst urea:

It reacts amongst urea in addition to decomposes it to hand CO2 in addition to N2

Reaction amongst aniline:

It reacts amongst aniline hydrochloride to hand diazonium compounds. This procedure is called diazotization.

Safety Hazards or Health Effects.

Nitrous acid is a rigid oxidizer, in addition to is destroyed when combined amongst phosphorus trichloride (PCL3). It is non toxic enough, however, it tin campaign respiratory illness in addition to campaign about symptoms of irritation inwards asthma patients.