There exist an equilibrium between solid , and ions in aqueous medium. Now, if equilibrium is distur — Ionic Equilibrium Chemistry Question
Question
There exist an equilibrium between solid $\text{BaSO}_4$, $\text{Ba}^{2+}$ and $\text{SO}_4^{2-}$ ions in aqueous medium. Now, if equilibrium is disturbed by addition of (a) $\text{BaNO}_3$ and (b) $\text{K}_2\text{SO}_4$ in different experiments and the equilibrium is re-achieved, then match the columns given below. (Thick line represents the initial equilibrium and the dotted line represents the approach of system towards equilibrium.)<br><br>(a) Addition of $\text{BaNO}_3$<br>(b) Addition of $\text{K}_2\text{SO}_4$<br>[Graphs provided in source: (c), (d), (e), (f)]
💡 Solution & Explanation
The thick curve represents the equilibrium state ($[\text{Ba}^{2+}][\text{SO}_4^{2-}] = K_{sp}$). Adding $\text{BaNO}_3$ corresponds to an instantaneous vertical spike in $[\text{Ba}^{2+}]$, followed by precipitation that slides the system down and left back to the curve. This matches graph (d). Adding $\text{K}_2\text{SO}_4$ corresponds to an instantaneous horizontal jump in $[\text{SO}_4^{2-}]$, followed by precipitation moving the system left and down to the curve. This matches graph (e). Thus, the correct pairings are (a)-(d) and (b)-(e). Therefore, correct answer is B.