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  4. What will be the difference in pH of 10-3 M KOH solution and 10-5 M KOH solution?

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Q. What will be the difference in $pH$ of $10^{-3} M$ $KOH$ solution and $10^{-5} M\, KOH$ solution?

Equilibrium

Solution:

$[ OH ^{-}]=10^{-3} M$
$ \therefore pOH =3 $
$[ OH ^{-}]=10^{-5} M $
$\therefore pOH =5 $
$pH + pOH =14, $
$\therefore pH =14-3=11$
$pH + pOH =14, $
$\therefore pH =14-5=9$
Difference $=11-9=2$