1.

50mL of 0.05M Propane -1,2-diamine solution is titrated with 0.1M HCl solution at 25^(@)C. Detemine the pH of solution obtained by adding following volumes of HCl solution.

Answer»

Solution :(a) HALF neutralisation :`pH=pK_(a_(1))=14-4.18=9.82`
(B)`pH=((pK_(a_(1))+pK_(a_(2)))/(2))=(14-4.18+14-7.39)/(2)=8.215`
(c ) BUFFER: `pH=14-7.39+log((2.5-0.5)/(0.5))=7.21`


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