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What is the pH of 0.01 M glycine solutio...

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`

A

`3.0`

B

`10.0`

C

`6.1`

D

`7.1`

Text Solution

Verified by Experts

The correct Answer is:
D
`K=K_(a_(1))xxK_(a_(2))=4.5xx10^(-3)xx1.7xx10^(-10)`
`=7.65xx10^(-13)=76.5xx10^(-14)`
`[H^(+)]= sqrt(KC)= sqrt(76.5xx10^(-4)xx10^(-2))`
`=sqrt(76.5xx10^(-16)`
`[H^(+)]=8.7xx10^(-8)`
`=P^(H)=-log_(10)[8.7xx10^(-8)]`
`=8-log8.7, =8-0.9395 P^(H)=7.1`
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