Question

The `pK_(a)` of acetic acid is 4.74 . The concentration of `CH_(3)C O O H ` is 0.01 M. The pH of `CH_(3) C O O H` is
A. 3.37
B. 4.37
C. 4.74
D. 0.474

Answer 1

Correct Answer - A
For a weak acid, `pH=(1)/(2) [pK_(a)-log c]`
`=(1)/(2)[4.74-log 10^(-2)]=(1)/(2)xx6.74=3.37`