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10 mL of H(2)A(weak diprotic acid) solut...

10 mL of `H_(2)A`(weak diprotic acid) solution is titrated against 0.1M NaOH. pH of the solution is plotted against volume of strong base added and following observation is made. If pH of the solution at first equivalence point is `pH_(1)` and at second equivalence point is `pH_(2^.)` Calculate the value of `(pH_(2)-pH_(1))` at `25^(@)C`
Given for `H_(2)A,pK_(a_1)` =4.6 and `pK_(a_2)` =8, log 25=1.4

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