How is laughing gas prepared in a lab?

They heat ammonium nitrate ( NH4NO3 ) which gives out 2 gases Water vapour (H2O) and nitric oxide (N2O) which is laughing gas and they collect it. read more

The gas in the collection jar is your nitrous oxide or laughing gas, plus lesser amounts of other nitrogen oxides, including nitric oxide or nitrogen monoxide. Nitric oxide eventually is oxidized to nitrous oxide upon exposure to oxygen, although acid and base treatments are used to remove impurities for commercial-scale production of nitrous oxide. read more

Preparation of laughing gas at home: Nitrous oxide is popularly known as the laughing gas. As the name suggests, the release of this gas in the atmosphere and in the surroundings, makes a person laugh. read more

Nitrous oxide, N2O, is almost always prepared by heating ammonium nitrate (thermal decomposition) to 180 - 250 degree C. NH4NO3 = N2O + 2 H2O The temperature should be kept within 250 degree C by slow heating, as ammonium nitrate has a tendency to explode at higher temperatures. This method is quite safe when one is careful about the temperature. read more