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Q.
Solution of a monobasic acid has a $pH = 5$. If one mL. of it is diluted to $1$ litre, what will be the $pH$ of the resulting solution?
Equilibrium
Solution:
$pH=5$, $\left[H^{+}\right]=10^{-5}\,M$
After dilution $=\frac{10^{-5}}{1000}=10^{-8}\,M$
Total $\left[H^{+}\right]=10^{-8}+10^{-7}=1.1\times10^{-7}$
$pH=-log\left[H^{+}\right]$
$=-log\,\left(1.1\times10^{-7}\right)$
$=6.96$