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Boric acid Br(OH)(3) is monobasic Lewis ...

Boric acid `Br(OH)_(3)` is monobasic Lewis acid if gives `H^(+)` ions in aquoeus soluions as follows `B(OH)_(3) + H_(2)O hArr [B(OH)_(4)]^(-) + H^(+)`
`K_(a) = 5.9 xx 10^(-10)` The `P^(H)` of `0.025M` aqueous solution is `[log 5.9 = 0.771]`

A

`5.42`

B

`4.52`

C

`2.45`

D

`4.675`

Text Solution

Verified by Experts

The correct Answer is:
A
`P^(H)=-(1)/(2)[logK_(a)+logC]`
`=-(1)/(2)[log(5.9xx10^(-10))+log(0.025)]`
`=-(1)/(2)[(-10+log5.9)+(-2+log2.5)]` =-(1)/(2)[(-9.229)+(-1.6021)]`
`=-(1)/(2)[9.2229-1.6021]`
`=-(1)/(2)[-10.8311]=5.4255`
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