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Introduction and Degree of Hydrolysis

Calculate the...

Question

Calculate the pH of a solution which is $10^{- 1} M i n H C l a n d 10^{- 3} M i n C H_{3} C O O H [K_{a} = 2 \times 10^{- 3}]$

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Solution

The correct option is C 1
$H^{+}$ ion can be considered completely from HCI due to less dissociation of $C H_{3} C O O H$ (because of common ion effect by $H^{+}$ of HCI, $α$ << 1) and its low conc. So, $[H^{+}] = 10^{- 1} M$
$∴ p H = 1$

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