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=Ka_(1)xxKa_(2)=4.5xx10^(-3)xx1.7xx10^(10)`
`=7.65xx10^(-13)`
`[H^(+)]=sqrt(KC)=sqrt(7.65xx10^(-13)xx0.01`
`=sqrt(7.65x10^(-15)=0.87xx10^(-7)`
`pH=log 0.87xx10^(-7)=7-0.93=6.07`.