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During the titration of a weak diprotic ...

During the titration of a weak diprotic acid `(H_(2)A)` against a strong base `(NaOH)`, the pH of the solution half-way to the first equivalent point and that at the first equivalent point are given respectively by:

A

`pK_(a1) and pK_(a1)+pK_(a2)`

B

`sqrt(K_(a1)C) and(pK_(a1)+pK_(a2))/2`

C

`pK_(a1)and(pK_(a1)+pK_(a2))/2`

D

`pK_(a1)andpK_(a2)`

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