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A weak base (BOH)with K(b)=10^(-5) is ti...

A weak base (BOH)with `K_(b)=10^(-5)` is titrated with a strong acid JCl.at `3/4th` of the equivalence point pH of the solution is

A

`5 + log3`

B

`14 - 5 - log 3`

C

`14 - 5 + log 3`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
2
Let the initial equivalent of BOH be x
`{:(" "BOH" + "HCl to BCl " + "H_(2)O),("Initial equivalnet "x " "3//4x " 0 0" ),("At" 3//4^(th) " eqv. pt . " x - (3x)/4 = x/4 " " 0 " " 3/4 x " " 3/4 x):}`
`pOH = pK_(b) + log. "[salt]"/"[Base]" = 5 + log . (3x xx 4)/(4 xx x) = 5 + Log 3`
`pH = 14 - 5 - log 3 = 8.523`
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