Answer
The Kb of $C_6H_5O^-$ is approximately 7.69 $\times 10^{-5}$.
Work Step by Step
$K_a \times K_b = K_w$
$1.3\times 10^{-10} \times K_b = 10^{-14}$
$K_b = \frac{10^{-14}}{1.3\times10^{-10}}$
$K_b \approx 7.6923 \times 10^{-5} $
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