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Salt of Weak Acid and Weak Base

Ka for a weak...

Question

$K_{a}$ for a weak acid $H A$ is $2 \times 10^{- 5}$ . What is the value of $K_{b}$ for $A^{-}$ ?

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Solution

$K_{a} = K_{b} = K_{w} = 10^{- 14}$
$K_{b} = 10^{- 14} / (2 \times 10^{- 5})$
$= 5 \times 10^{- 10}$

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Salt of Weak Acid and Weak Base

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