20 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its neutralization. A solution (X) was prepared by mixing 20 mL of the above acetic acid and 14.2 mL of 0.1 M NaOH solution. What is the pH of the solution $(\mathrm{X}) ?\left(\mathrm{pK}_{\mathrm{a}}\right.$ value of acetic acid is 4.75$)$.
Select the correct option:
A
7.0
B
4.75
C
3.5
D
4.82
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
In experiment $1,28.4 \mathrm{ml}$ of NaOH is required for complete neutralisation, therefore for 14.2 ml , half equivalence point will be achieved to form acidic buffer.
$$
\mathrm{pH}=\mathrm{pKa}
$$
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