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50mL of 0.05M Propane -1,2-diamine solut...

`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.

Text Solution

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(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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