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  4. The pH value of 1/1000 N-KOH solution is :

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Q. The $ pH $ value of $ 1/1000 N-KOH $ solution is :

UPSEEUPSEE 2006

Solution:

In $\frac{N}{1000} KOH$ solution, $\left[OH^{-}\right] = 10^{-3}M $
$pOH = - log\left(OH^{-}\right) = - log \left[10^{-3}\right] $
$= + 3\,log\, 10 $
$ = 3 $
$ pH +pOH = 14 $
$ pH = 14 -pOH$
$ = 14 - 3 = 11$