Laboratory preparations of Methane...??
Dear Student
In the laboratory, methane is prepared by heating a mixture of anhydrous sodium acetate and soda lime.
CH3COONa + NaOH : CaO CH​4 + Na2CO3
Anhydrous sodium acetate and soda lime are taken in the ratio 1:3 by weight and the mixture is taken in a dry hard glass test tube fitted with a cork through which a delivery tube passes. The hard glass test tube is now heated strongly and methane is liberated. Methane thus produced is collected in a gas jar by the downward displacement of water. Methane thus prepared contains traces of ethylene, acetylene, hydrogen and moisture as impurities.
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Removal of impurities
Acetylene is removed by passing the impure gas through ammoniacal cuprous chloride solution
Ethylene and moisture are removed by passing the gas through fuming sulphuric acid.
Hydrogen is removed by absorbing it in alkaline pyrogallal solution. The gas is then passed through conc.H2SO4 to remove moisture.
Regards.
In the laboratory, methane is prepared by heating a mixture of anhydrous sodium acetate and soda lime.
CH3COONa + NaOH : CaO CH​4 + Na2CO3
Anhydrous sodium acetate and soda lime are taken in the ratio 1:3 by weight and the mixture is taken in a dry hard glass test tube fitted with a cork through which a delivery tube passes. The hard glass test tube is now heated strongly and methane is liberated. Methane thus produced is collected in a gas jar by the downward displacement of water. Methane thus prepared contains traces of ethylene, acetylene, hydrogen and moisture as impurities.
Removal of impurities
Acetylene is removed by passing the impure gas through ammoniacal cuprous chloride solution
Ethylene and moisture are removed by passing the gas through fuming sulphuric acid.
Hydrogen is removed by absorbing it in alkaline pyrogallal solution. The gas is then passed through conc.H2SO4 to remove moisture.
Regards.