Question

What is the pOH of 10-3 M acetic acid? pk of
CH,COO = 9.26
(1) 3.87
(3) 10.13
(2) 7.74
(4) 4.74
​

Answer 1

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Answer 2

Step by Step explanation:

Given: $CH, COO=9.26$

To find: $pH$ of $10^{-3}M$ acetic acid.

For calculation of pH,

⇒ $pH=7+ \frac{1}{2} (pK_{a} + logC)$

⇒ $7+ \frac{1}{2} (4.74+2)$

⇒ $7 + \frac{6.74}{2}$

The LCM is 2.

⇒ $\frac{14}{2} + \frac{6.74}{2}$

⇒$\frac{20.74}{2}$

⇒$10.13$

The pH of acetic acid is (3)$10.13$.