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A buffer solution is prepared by mixing ...

A buffer solution is prepared by mixing 0.1 M ammonia and 1.0 M ammonium chloride. At 298 K, the `pK_(b)` of `NH_(4)OH` is 5.0. The pH of buffer is :

A

`10.0`

B

`9.0`

C

`6.0`

D

`8.0`

Text Solution

Verified by Experts

The correct Answer is:
A
The pOH of a buffer consisting of `NH_(3)` (i.e. `NH_(4)OH`) and salt ` NH_(4)Cl` (salt) is given by the equation
`pOH=pK_(b)=loghArr=5.0+log""([0.1])/([1.0])`
`=5.0-log10=5-1=4.0`
`pH+pOH=14`
`pH=14-4to10`
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