MHT CET · Chemistry · Ionic Equilibrium
What is \(\mathrm{pH}\) of solution containing \(50 \mathrm{~mL}\) each of \(0.1 \mathrm{M}\) sodium acetate and \(0.01 \mathrm{M}\) acetic acid? \(\left(\mathrm{pK}_{\mathrm{a}} \mathrm{CH}_3 \mathrm{COOH}=4.50\right)\)
- A \(2.5\)
- B \(3.5\)
- C \(4.5\)
- D \(5.5\)
Answer & Solution
Correct Answer
(D) \(5.5\)
Step-by-step Solution
Detailed explanation
For acidic buffer solution
\(
\begin{aligned}
& \mathrm{pH}=\mathrm{pK}_{\mathrm{a}}+\log _{10} \frac{[\text { Salt }]}{[\text { Acid }]} ; \\
& \mathrm{pH}=4.50+\log _{10} \frac{0.1}{0.01} \\
& \mathrm{pH}=4.50+\log 10 ; \mathrm{pH}=5.50
\end{aligned}
\)
\(
\begin{aligned}
& \mathrm{pH}=\mathrm{pK}_{\mathrm{a}}+\log _{10} \frac{[\text { Salt }]}{[\text { Acid }]} ; \\
& \mathrm{pH}=4.50+\log _{10} \frac{0.1}{0.01} \\
& \mathrm{pH}=4.50+\log 10 ; \mathrm{pH}=5.50
\end{aligned}
\)
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