MCQ
The $pH$ of the solution containing $50\, mL$ each of $0.10\, M$ sodium acetate and $0.01\, M$ acetic acid is $.......$
[Given $pK _{ a }$ of $CH _{3} COOH =4.57$ ]
- A$3.57$
- B$4.57$
- C$2.57$
- ✓$5.57$
✓
Answer
Correct option: D.
$5.57$
d
Weak acid $\left( CH _{3} COOH \right)$ and salt of weak acid-strong base $\left( CH _{3} COONa \right)$ form an acidic buffer.
Weak acid $\left( CH _{3} COOH \right)$ and salt of weak acid-strong base $\left( CH _{3} COONa \right)$ form an acidic buffer.
Sodium acetate $\left( CH _{3} COONa \right)=0.10\, M$;
Acetic acid $\left( CH _{3} COOH \right)=0.01\, M$;
$pH$ of acidic buffer solution is given by
$pH = pK _{ a }+\log \frac{[\text { Salt }]}{[\text { Acid }]}$
$=4.57+\log \left(\frac{0.1}{0.01}\right)$
$=5.57$
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