For (a) $\mathrm{KNO}_2$:
- Potassium nitrate dissociates into $\mathrm{K}^+$ and $\mathrm{NO}_2^-$ ions.
For (b) $\mathrm{Mg}\left(\mathrm{C}_2 \mathrm{H}_3 \mathrm{O}_2\right)_2$:
- Magnesium acetate dissociates into $\mathrm{Mg}^{2+}$ and
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