Do doctors still use laughing gas? || what is Nitrous Oxide?

Do doctors still use laughing gas? || what is Nitrous Oxide?

  • Sodium nitrite – NaNO2
  • Copper sulfate – CuSO4
  • Potassium permanganate – KMnO₄
  • Ferric chloride – FeCl3
  • Stannic chloride – SnCl₄
  • Ammonia nitrate – NH4NO3
  • Ammonia sulfate – (NH₄)₂SO₄
  • Ferrous sulfate – FeSO4
  • potassium hypochlorite – KClO

Priestley first made nitrous oxide gas in 1772 and Devi studied its properties. Smelling this gas causes laughter. For this reason, it is also called laughing gas.

Nitrous oxide


Oxidation of hydroxylamine

nitrous oxide is obtained by oxidizing hydroxylamine salts with Sodium nitrite, copper sulfate, potassium permanganate or ferric chloride.

NH2OH.HCl + NaNO2 → NaCl + 2H2O + N2O

Reduction of nitric acid

reduction of HNO3 by stannic chloride (SnCl₄) and HCl gives nitrous oxidation.

4SnCl2 + 8HCl + 2HNO3 → 4SnCl4 + 5H2O + N2O

Dilute HNO3

when cold and the molecule HNO3 reacts with Zn, N2O is obtained.

4Zn + 10HNO3 → 4Zn(NO3)2 + 5H2O + N2O

Heating ammonia nitrate

Nitrous oxide is obtained by heating ammonia nitrate. On heating the ammonia nitrate alone, it melts at 1650C, starts to decompose at 1850C and starts exploding at 2400C. In the laboratory, nitrous oxide gas was first created by heating a mixture of ammonia sulfate and ammonia nitrate. The ammonia nitrate obtained from the mixture does not explode and Nitrous oxide gas is obtained.

(NH₄)₂SO₄ + 2NaNO3 → Na2SO4 + 2NH4NO3

NH4NO3 → N2O + 2H2O

Ammonia chloride and ammonia nitrate doing the same reactions:

NH₄Cl + NaNO3 → NaCl + NH4NO3

NH4NO3 → N2O + 2H2O

Laboratory method:

In the laboratory, the flask is heated by mixing a mixture of sodium nitrate and ammonia sulfate. The obtained nitrous oxide gas is affected by KOH, FeSO4 and concentrated sulfuric acid. Which removes impurities of chlorine, nitric oxide and ammonia respectively. N2O collects gas in hot water. Because it is soluble in cold water.

Laboratory method of making nitrous oxide

2KOH + Cl2 → KCl + KClO + H2O

2NaOH + Cl2 → NaCl + NaClO + H2O

FeSO4 + NO → FeSO4.NO

2NH3 + H2SO4 → (NH4)2SO4

Physical Properties:

This colorless sweet taste has gas. It is a fusion of water and alcohol. Its smell causes laughter. The smell in excess makes the man unconscious. And can also die of the throat.

Chemical Properties:

It has no effect on litmus. Hence it is indifferent.

On heating, it gives nitrogen and oxygen.

2N2O → 2N2 + O2

It gives oxygen on heating. Therefore, it helps in burning things like oxygen.

S + 2N2O → 2N2 + SO2

C + 2N2O → 2N2 + CO2

2P + 5N2O → 5N2 + P2O5

It dissipates when flowing over hot copper.

Cu + N2O → N2 + CuO

Use of N2O

Nitrous Oxide uses for especially in surgery and dentistry.


The molecular formula of Nitrous Oxide is N2O and the structure is like this:

N ≡ N → O

The nitrogen atoms in nitrous oxide are sp hybridized and it is a linear molecule. nitrous oxide is a polar co-ordinate molecule and its two-pole base must be higher, in fact, its double pole base is very useful. For this reason, it is assumed that it is a resonant hybrid of the following two structures.

nitrous oxide


Hello Friends, My name is Sanjay Bhandari. I am a chemistry Teacher.

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