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Lewis Theory

A 0.10 M so...

Question

A $0.10 M$ solution of $H F$ is $8.0 %$ ionized. What is the $K_{a}$ ?

6.4 \times 10^{- 4}

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8.8 \times 10^{- 4}

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6.95 \times 10^{- 4}

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7.6 \times 10^{- 4}

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Solution

The correct option is A $6.4 \times 10^{- 4}$
As we know, $C α^{2} = K_{a} = 0.1 \times (0.08)^{2} = 6.4 \times 10^{- 4}$ .

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