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# Strength of Conjugate Base

APCHEM-85D1QU
Acid $K_{a1}$ $\hspace{3cm}$ $K_{a2}$ $\hspace{3cm}$
$H_3BO_3$ $5.4 × 10^{-10}$ --
$H_2CO_3$ $4.3 × 10^{-7}$ $5.6 × 10^{-11}$
$HC_2H_3O_2$ $1.8 × 10^{-5}$ --
$HC_7H_5O_2$ $6.5 × 10^{-5}$ --
$HF$ $3.5 × 10^{-4}$ --

$\$
Analyze the data above.

Which of the following is the strongest conjugate base?

A

$HCO_3 \ ^-$

B

$F^-$

C

$CO_3 \ ^{2-}$

D

$H_2BO_3 \ ^-$