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10 mL of H(2)A(weak diprtic acid) soluti...

10 mL of `H_(2)A`(weak diprtic acid) solutio is titrated against 0.1M NaOH. pH of the solution is plotted against volume of strong base added and following obserbation is made

If pH of the solution at first equivalence point is pH1 and at second equivalence point is pH2 . Calculate the value of pH2- pH1 at 25 C . Given for H2A, pKa1 =4.6 and pKa2 = 8 , log 25 = 25 1.4

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