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Organic Compounds

Calculate p...

Question

Calculate $p H$ of $10^{- 6} M {C H}_{3} C O O H$ solution ( write the value to the nearest integer).

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Solution

Given that,

$C H_{3} C O O H = 10^{- 6} M$

We know that,

For acetic acid $K_{a} = 1.8 \times 10^{- 5}$

and $H^{+} = \sqrt{K_{a} C}$

$= \sqrt{1.8 \times 10^{- 5} \times 10^{- 6}}$

$= \sqrt{18 \times 10^{- 12}}$

$H^{+} = 4.243 \times 10^{- 6}$

$p H = - log (4.243 \times 10^{- 6})$

$= - 0.627 + 6$

$p H = 5.4$

$p H \approx 5$

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