\text { b.) } \mathrm{BaC}_{2} \mathrm{O}_{4}(\mathrm{~s})+\mathrm{H}^{+1}(\mathrm{aq}) \leftrightarrow \mathrm{Ba}^{+2}(\mathrm{aq})+\mathrm{HC}_{2} \mathrm{O}_{4}^{-1}(\mathrm{aq}) Reagents used to Establish Equilibrium: BaCl₂ and (NH4)2C₂O4 Reagents Used to Shift Equilibrium to the Right: HCI Ionic Equation: Reagents Used to Shift Equilibrium to the Left: NH3 and (NH4)₂C₂O4 Ionic Equation: