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Determining $K_b$ of Nitrite Ion from the $K_a$ of Conjugate Acid

CHEM-SBFBT1

The $K_a$ of nitrous acid is $4.0 \times 10^{-4}$.

What is the $K_b$ of the nitrite ion?

A

$2.5 \times 10^{-11}$

B

$4.0 \times 10^{-10}$

C

$4.0 \times 10^{-4}$

D

None of the above.

E

Not enough information is provided.