Chemical and Ionic Equilibrium - Result Question 132
####74. The concentration of hydrogen ions in a
What will be the
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Solution:
In the above buffer solution, the significant source of formate ion
$$ \begin{aligned} K _a & =2.4 \times 10^{-4} \ & =\frac{\leftH^{+}\right}{[HCOOH]} \ {\left[H^{+}\right] } & =\frac{2.4 \times 10^{-4} \times 0.20}{0.75}=6.4 \times 10^{-5} \ pH & =-\log \left(6.4 \times 10^{-5}\right)=4.20 \end{aligned} $$
