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  4. Calculate the pH of a solution which contains 10 ml of 1 M HCl and 10 ml of 2 M NaOH

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Q. Calculate the $pH$ of a solution which contains $10 \,ml$ of $1 \,M\, HCl$ and $10 \,ml$ of $2 \,M\, NaOH$

Equilibrium

Solution:

image

$\left[ OH ^{-}\right]$ left from $NaOH =\frac{10}{20}=0.5 \,M$

$pOH =-\log OH ^{-}=-\log 0.5$

$pOH =0.3$

$pH =13.7$