Acid that gives highest pH at equivalence pt when 0.2 M soln each acid titrated 0.2 M soln NaOH.
The acid dissociation constant (Ka) for HCOOH, CH3COOH, ClCH2COOH, HCN at 25 deg are 1.8 X10-4, 1.8 X10-5, 1.4 X10-3 , 4.8 X10-10 respectively. The acid that gives the highest pH at the equivalence point when 0.2 M solution of each acid is titrated with 0.2 M solution of NaOH.
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At equivalence point, conjugate base exists