What is the `pH` of `0.01 M` glycine solution? For glycine, `K_(a_(1))=4.5xx10^(-3)` and `K_(a_(2))=1.7xx10^(-10)` at `298 K`

Options

A. `3.0`
B. `10.0`
C. `6.1`
D. `7.2`

Answer

C

Explanation

`K= K_(a_(1))xxK_(a_(2))=4.5xx10^(-3)xx1.7xx10^(10)`
`H^(+)=sqrt(K_(c))=sqrt(1.4xx10^(-3)xx1.7xx10^(-10)xx0.01a)`
`= 0.87xx10^(-7)`
`pH= -log 0.87xx10^(-7)=7-0.93=6.07`