Chemistry

Problem

Two monoprotic weak acids, HX and HY, are each titrated separately with 0.100 M NaOH until the equivalence point is reached. Both titrations begin with 25.0 mL of 0.100 M acid. The dissociation constants are

K_{a,\text{HX}} = 1.0 \times 10^{-5}

and

K_{a,\text{HY}} = 1.0 \times 10^{-7}

. Which of the following best describes the relationship between the equivalence-point pH values,

\text{pH}_{\text{eq}}

, of the two titrations? a)

\text{pH}_{\text{eq}}(\text{HX}) \, = \, \text{pH}_{\text{eq}}(\text{HY})

\text{pH}_{\text{eq}}(\text{HY}) \, > \, \text{pH}_{\text{eq}}(\text{HX})

\text{pH}_{\text{eq}}(\text{HX}) \, > \, \text{pH}_{\text{eq}}(\text{HY})

d) The relative values cannot be predicted without additional data.

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