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Salt of Weak Acid and Weak Base

The solution ...

Question

The solution of a salt of a weak acid and weak base will have pH: ( $K_{b} = 1 \times 10^{- 6}$ and $K_{a} = 1 \times 10^{- 4}$ )

7.0

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6

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4.0

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Solution

The correct option is C $6$
For a salt of weak acid and weak base
$p H = 7 + 0.5 (p K_{a} - p K_{b})$
$p K_{a} = 4$ and $p K_{b} = 6$
So $p H = 7 + 0.5 (4 - 6) = 6$

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