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## AP®︎/College Chemistry

### Course: AP®︎/College Chemistry>Unit 8

Lesson 3: Weak acid and base equilibria

# Weak acid and base equilibria

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## Problem

$\mathrm{HNO}{\phantom{A}}_{2}\left(aq\right)+\mathrm{H}{\phantom{A}}_{2}\mathrm{O}\left(l\right)⇌\mathrm{H}{\phantom{A}}_{3}\mathrm{O}{\phantom{A}}^{+}\left(aq\right)+\mathrm{NO}{\phantom{A}}_{2}{\phantom{A}}^{-}\left(aq\right)$
The ionization of the weak acid $\mathrm{HNO}{\phantom{A}}_{2}$ in water is represented by the equation above.
What is the percent ionization of $\mathrm{HNO}{\phantom{A}}_{2}$ in $1.5\phantom{\rule{0.278em}{0ex}}M\phantom{\rule{0.278em}{0ex}}\mathrm{HNO}{\phantom{A}}_{2}\left(aq\right)$? (For $\mathrm{HNO}{\phantom{A}}_{2}\left(aq\right)$, ${K}_{a}=5.6×{10}^{-4}$.)
$\mathrm{%}$