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  • pKa value of acetic acid is 4.75. If the buffer solution contains 0.125 M acetic acid and 0.25 M sodium acetate, the pH of buffer solution is:Opt

pKa value of acetic acid is 4.75. If the buffer solution contains 0.125 M acetic acid and 0.25 M sodium acetate, the pH of buffer solution is:

Option: 1

10.5


Option: 2

50.5


Option: 3

5.05


Option: 4

1.05


Answers (1)

best_answer

As we learnt,

\begin{aligned} \mathrm{pH} &=\mathrm {p K_{a}}+\log \frac{[\mathrm{Salt}]}{[\mathrm{Acid}]} \\ &=4.75+\log \frac{0.25}{0.125}=5.05 \end{aligned}

Therefore,option(3) is correct

Posted by

shivangi.shekhar

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