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Basic Buffer Action

A buffer solu...

Question

A buffer solution is made up of acetic acid $[p K_{a} = 5]$ having conc. $= 1.5 M$ and sodium acetate having conc. $= 0.15 M$ . What is the number of $O H^{-}$ ions present in $1 l i t r e$ solution?

10^{- 10} M

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10^{- 4} M

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10^{- 3} M

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10^{- 6} M

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Solution

The correct option is A $10^{- 10} M$
As we know,
$p H = p K_{a} + l o g \frac{s a l t}{a c i d} = 5 + l o g \frac{0.15}{1.5} = 5 - 1 = 4$
$p O H = 14 - p H = 14 - 4 = 10;$

$\Rightarrow [O H^{-}] = 10^{- 10}$

$∴ [O H^{-}] = 10^{- 10} M$ .

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