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  4. Equal volume of solution with pH =3 and pH =11 are mixed. The pH of the resulting solution is

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Q. Equal volume of solution with $pH =3$ and $pH =11$ are mixed. The $pH$ of the resulting solution is

Solution:

If $pH =3$, then $\left[ H ^{+}\right]=10^{-3} \& pH =11$, then $pOH =3$ and $[ OH^- ]=10^{-3}$. If equal volumes of two solutions with pH values 3 and 11 are mixed, then $pH$ of resulting solution is 7 because $\left[ H ^{+}\right]$of $1^{\text {st }}$ solution is equal to $\left[ OH ^{-}\right]$of second solution.