Question

Which of the following equations are correctly represented for $0.10\text{M}$ solution of acetic acid in water?

• A. $\left[HOAc\right]={\left[HOAcc\right]}_{eq.}+{\left[O{Ac}^{-}\right]}_{eq.}=0.10\text{M}$
• B. ${\left[H^{+}\right]}_{eq.}={\left[O{Ac}^{-}\right]}_{eq.}+{\left[O{H}^{-}\right]}_{eq.}$
• C. $\left[H^{+}\right]>\left[O{H}^{-}\right]$
• D. All of the above

Answer 1

The correct option is D All of the above

In solution,
$HOAc\to OA{c}^{-}+H^{+}$
$H_{2}O\to H^{+}+O{H}^{-}$
in solution, total positive charge from all species equal to total negative charge from all species so
${\left[H^{+}\right]}_{eq.}={\left[O{Ac}^{-}\right]}_{eq.}+{\left[O{H}^{-}\right]}_{eq.}$.
Also, analytical concentration of a species is equal to the sum of the equillbrium concentration of all its species
$\left[HOAc\right]={\left[HOAcc\right]}_{eq.}+{\left[O{Ac}^{-}\right]}_{eq.}=0.10M$
and in acidic solution,
$\left[H^{+}\right]>\left[O{H}^{-}\right]$