Select the charge balance equation for an aqueous solution of MnCl$_2$ that ionizes to Mn$^{2+}$, Cl$^-$, MnCl$^+$, and MnOH$^+$.
[Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = [Cl$^-$]
[Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = 2 [Cl$^-$]
[Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = [Cl$^-$] + [OH$^-$]
2 [Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = [Cl$^-$] + [OH$^-$]
[Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = 2 [Cl$^-$] + [OH$^-$]
[H$^+$] + [Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = [Cl$^-$] + [OH$^-$]
[H$^+$] + 2 [Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = [Cl$^-$] + [OH$^-$]
[H$^+$] + [Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = 2 [Cl$^-$] + [OH$^-$]
2 [Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = [Cl$^-$]
Select the mass balance equation for the same solution.
[Mn$^{2+}$] = 2 [Cl$^-$]
[Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = [MnCl$^+$] + 2 [Cl$^-$]
2 [Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = [MnCl$^+$] + [Cl$^-$]
2 ([Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$]) = [MnCl$^+$] + [Cl$^-$]
2 [Mn$^{2+}$] = [Cl$^-$]
[Mn$^{2+}$] + [MnCl$^+$] + [MnOH$^+$] = 2 ([MnCl$^+$] + [Cl$^-$])