Is it possible to precipitate $\mathbf{99}\mathbf{.}\mathbf{0}\mathbf{\%}$of role="math" localid="1663573455203" $\mathbf{0}\mathbf{.}\mathbf{010}{\mathbf{MCe}}^{\mathbf{3}\mathbf{+}}$by adding oxalate $\mathbf{\left(}{\mathbf{C}}_{\mathbf{2}}{{\mathbf{O}}^{\mathbf{2}}}_{\mathbf{4}}\mathbf{\right)}$without precipitating $\mathbf{0}\mathbf{.}\mathbf{010}{\mathbf{MCe}}^{\mathbf{2}\mathbf{+}}$?

role="math" localid="1663574065069" $$\begin{gathered} {\mathbf{CaC}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{4}}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}{\mathbf{K}}_{\mathbf{sp}}\mathbf{}\mathbf{=}\mathbf{}\mathbf{1}\mathbf{.}\mathbf{3}\mathbf{\times }{\mathbf{10}}^{{}_{\mathbf{-}\mathbf{8}}} \\ {\mathbf{Ce}}_{\mathbf{2}}\mathbf{}\mathbf{(}\mathbf{C}\mathbf{2}\mathbf{}\mathbf{O}\mathbf{4}\mathbf{}\mathbf{)}\mathbf{3}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}{\mathbf{K}}_{\mathbf{sp}}\mathbf{}\mathbf{=}\mathbf{5}\mathbf{.}\mathbf{9}\mathbf{\times }{\mathbf{10}}^{\mathbf{-}\mathbf{30}} \end{gathered}$$

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