If `pK_(a)=-"log"K_(a)=4`, and `K_(a)=Cx^(2-)` then Van't Hoff factor for weak monobasic acid when `C=0.01M` is:

Options

A. `1.01`
B. `1.02`
C. `1.10`
D. `1.20`

Answer

C

Explanation

`HA harr^(+)+A^(-)`
`i=[1+y-1x]=1+x`
`pK_(a)=4-0log K_(a)`
`:.K_(a)-10^(4)=Cx^(2)`
`1xx10^(-4)=0.1xx x^(2)`
`x=0.1`
`:.i=1+x=1.1`
Hence, (C) is the correct answer.