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When a solution of $1.50 \textrm{ M}$ nitrous acid reaches equilibrium, the $pH$ is $1.61$. What is the $K_a$ for nitrous acid?

A

$4.06 \times 10^{-4}$

B

$1.66 \times 10^{-2}$

C

$2.45 \times 10^{-2} $

D

$3.39$

E

$2.46 \times 10^3 $