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  Ramsay-Raleighs method

Ramsay-Raleigh’s method:

A mixture of air and oxygen is continuously admitted into a glass globe of around 50 liters capacity. Two platinum electrodes are brought up and a discharge from a transformer of around 6000 - 8000 volts is passed by the action of which nitrogen and oxygen quickly combine to form oxides of nitrogen. The oxides are then dissolved out in a solution of sodium hydroxide constantly circulated via the flask.

N2+ O2→ 2NO
2 NO + O2→ 2NO2
2NO2 + 2NaOH → NaNO3 + NaNO2 + H2O

Oxygen if any is eliminated by introducing alkaline pyrogallol in the world. The supply of air and electric discharge is close after some time and the left over mixture of noble gases are pumped out.

622_ramsay method.jpg


                                                       Figure: Chemical technique for isolation of noble gases

 

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