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HCIO is a weak acid. The concentrations of [H⁺] ions in 0 .1 M solution of HCIO (K_a = 5 x 10^-8) will be equal to

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7 .07 x 10^-5 M

5 x 10^-7 M

6 x 10^-7 M

7 x 10^-4 M

answer is A.

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Detailed Solution

$[H^{+}] = cα = \sqrt{[\frac{K_{a}}{c}]} = \sqrt{K_{a} c} = \sqrt{5 \times 10^{- 8} \times 0 .1}$
7 .07 x 10^-5 M

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