Will the following reaction take place as written (NH3 pka=37.7 and CH4 pka=47.7)? NH3(l) + Na+CH3-(l)...

Will the following reaction take place as written (NH₃ pka=37.7 and CH₄ pka=47.7)?

NH_3(l) + Na⁺CH₃^-_{(l) ------->} Na⁺NH₂^-_(l) + CH_4(g)

Expert Solution

The given reaction will take place. The reaction is an example of double replacement (displacement) reaction. Two compounds exchange ions to form two new compounds.

We know the relation,

Ka[NH3] = [NH2-][H+]/[NH3]

Ka[CH4] = [CH3-][H+]/[CH4]

pKa = -log[Ka]

pKa for NH3 is lower then the pKa of CH4, i.e. Ka of NH3 is higher then the Ka of CH4. Therefore, the probablity of CH4 forming CH3- and H+ is lower then NH3 going to NH2- and H+. Thus the reaction will favor forward direction and formation of NaNH2 and CH4. Hence this reaction will take place.

queen_honey_blossom answered 2 years ago

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