1.

A buffer solution has equal volumes of 0.2 M NH_(4)OH and 0.02 M NH_(4) CI The pk_(b) of the base is 5. The pH is

Answer»

A) 10
B) 9
C) 4
D) 7

Solution :`pOh=pK-(b)+log[sal t]/([base])`
`=5+log(0.02)/(0.2)=5+log(1)/(10)=5+(-1)=4`
`pH=14-pOH=14-4=10`


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