A 0.200 M solution of hypochlorous acid (HOCl) is found to be 3.2 % ionized at 25 °C

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A 0.200 M solution of hypochlorous acid (HOCl) is found to be 3.2 % ionized at 25 °C. What is the value of its acid-dissociation constant,

K_a

? (a)

6.4\times10^{-3}

(b)

2.1\times10^{-4}

(c)

4.1\times10^{-5}

(d)

2.0\times10^{-6}