Question

What is the `pH` of a `1 M CH_(3)COOH` a solution `K_(a)` of acetic acid `=1.8xx10^(-5)`?
`K=10^(-14)mol^(2) litre^(-2)`
A. `9.4`
B. `4.8`
C. `3.6`
D. `2.4`

Answer 1

Correct Answer - A
`CH_(3)COO^(-)+H_(2)OhArrCH_(3)COOH+OH^(-)`
`[OH^(-)]=cxxh` , `h=sqrt((K_(w))/(K_(a))xxc)=sqrt((10^(-14))/(1.8xx10^(-5))xx1)`
`=2.35xx10^(-5)`
`:. pOH=4.62`, `pH=9.38~~9.4`