The equivalence point in the titration of a weak acid HB with the strong base Na

Question

The equivalence point in the titration of a weak acid HB with the strong base NaOH is NOT at a pH of 7 because:

A. the conjugate base B– of the weak acid which remains at the end of the titration lowers the pH below 7.00. B. the conjugate base B– of the weak acid which remains at the end of the titration raises the pH above 7.00. C. a molar excess of strong base (NaOH) must be used to reach the equivalence point when titrating a weak acid D. because only very tiny amounts of strong base is required to titrate a weak acid E. The problem as stated is incorrect; the pH is equal to 7.00 at the equivalence point in all acid-base titrations.

Explanation / Answer

B. the conjugate base B– of the weak acid which remains at the end of the titration raises the pH above 7.00

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