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Organic Compounds

What is the p...

Question

What is the pH of a $0.1 M$ acid solution if the acid has a $K_{a}$ of $1 \times 10^{- 5}$ ?

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Solution

The correct option is E $3$
If we know pK $(K_{d})$ and concentration of a weak acid solution, we can calculate (predict )pH of the solution:
$p H = \frac{1}{2} \times p K - \frac{1}{2} \times l o g [A H]$

$p H$ $=$ $0.5 \times (- l o g (10^{-} 5))$ $-$ $0.5 \times l o g (0.1)$
so $p H$ $=$ $2.5 + 0.5$ $=$ $3$

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