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Titration of a Mixture

APCHEM-TNULJM

An acidic mixture containing $HF$ and $HI$ is a pH of 2.34. Enough 0.1 M $NaOH$ is titrated with the acidic mixture until the pH is 6.22.

Which of the following substances INCREASE after the 0.1 M $NaOH$ is added?

A

$F^-$

B

$I^-$

C

$H^+$

D

$HF$