First slide

Ionic equilibrium

Question

Which of the following solutions will have pH of 4.74?

Moderate

A

$100 mL of 1 M {CH}_{3} COOH ({pK}_{a} = 4, 74) at rhe equivalence point using NaOH$
B

$50 mL of 1 M {CH}_{3} COONa + 25 mL of 1 MHCl$
C

$50 mL of 1 M of {CH}_{3} COOH + 25 mL of 1 MNaOH$
D

Both (b) and (c)

Solution

Due to hydrolysis of CH₃COONa (formed at equivalence point), solution is alkaline pH > 7, hence (a) is not true.
In (b) and (c), [CH₃COOH] = [CH₃COONa]
$pH = {pK}_{a} + \log \frac{[{CH}_{3} COONa]}{[{CH}_{3} COOH]} = {pK}_{a}$

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