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pH the Power of H

For the react...

Question

For the reaction $H A + H_{2} O ⇌ A^{-} + H_{3} O^{+}$
The value of $K a$ is 6. Find the value of $p K a$ .

1 \times 10^{- 6}

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1 \times 10^{8}

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1 \times 10^{- 8}

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none of these

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Solution

The correct option is C $1 \times 10^{- 6}$
Acids differ in their $H^{+}$ donating ability. Measured based on their ability to donate $H^{+}$ to water
$H - A + H_{2} O ⇌ A^{-} + H_{3} O^{+}$
Position of the equilibrium relates to acid strength
$p K a = - l o g k_{a}$
$6 = - l o g k_{a}$
$k_{a} = {1 \times 10}^{- 6}$

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