Basic buffer





Let a basic buffer solution be prepared by mixing NH_4OH to ammonium chloride solution. NH_4OH is a weak base and does not produce appreciable oh^- ions.

Further, in presence of highly ionised NH_4Cl, its ionization is largely suppressed.

NH_4Cl \leftrightharpoons NH^+_4 + Cl^- \\[5mm] NH_4OH \leftrightharpoons \underset{(Common ion)}{NH^+_4} + OH^-

 

Now, when few drops of decinormal NaOH are added to this mixture, all its OH^- ions combine with NH^+_4 ions to form feebly ionised NH _4 OH and thus are consumed.

S0, no appreciable change in OH^- ion concentration occurs, hence pH value remains constant.

Acidic buffer

Acidic buffer




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