Which of the following carbonates will form first? Which of...

Which of the following carbonates will form first? Which of the following will form last? Explain. $$ \begin{array}{ll}{\text { (a) } \mathrm{MgCO}_{3}} & {K_{\mathrm{sp}}=3.5 \times 10^{-8}} \\ {\text { (b) } \mathrm{CaCO}_{3}} & {K_{\mathrm{sp}}=4.2 \times 10^{-7}} \\ {\text { (c) } \mathrm{SrCO}_{3}} & {K_{\mathrm{sp}}=3.9 \times 10^{-9}} \\ {\text { (d) } \mathrm{BaCO}_{3}} & {K_{\mathrm{sp}}=4.4 \times 10^{-5}} \\ {\text { (e) } \mathrm{MnCO}_{3}} & {K_{\mathrm{sp}}=5.1 \times 10^{-9}}\end{array} $$

Which of the following carbonates will form first? Which of the following will form last? Explain.
$$
\begin{array}{ll}{\text { (a) } \mathrm{MgCO}_{3}} & {K_{\mathrm{sp}}=3.5 \times 10^{-8}} \\ {\text { (b) } \mathrm{CaCO}_{3}} & {K_{\mathrm{sp}}=4.2 \times 10^{-7}} \\ {\text { (c) } \mathrm{SrCO}_{3}} & {K_{\mathrm{sp}}=3.9 \times 10^{-9}} \\ {\text { (d) } \mathrm{BaCO}_{3}} & {K_{\mathrm{sp}}=4.4 \times 10^{-5}} \\ {\text { (e) } \mathrm{MnCO}_{3}} & {K_{\mathrm{sp}}=5.1 \times 10^{-9}}\end{array}
$$

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Key Concepts

Precipitation Reactions

Precipitation reactions occur when the product of the concentrations of the ions in solution exceeds the Ksp of an ionic compound, leading to the formation of an insoluble solid (precipitate). Understanding these reactions is crucial for predicting which compounds will form precipitates under various conditions.

Solubility Product Constant (Ksp)

The solubility product constant (Ksp) is an equilibrium constant that applies to the dissolution of a sparingly soluble compound in water. It quantitatively expresses the product of the ion concentrations at saturation, and lower Ksp values generally indicate less soluble compounds that will precipitate at lower ion concentrations.

Selective Precipitation

Selective precipitation is a method used to separate ions based on differences in their solubilities. By comparing the Ksp values of different compounds, one can predict the order in which they will precipitate; typically, the compound with the lowest Ksp begins to precipitate first as the ionic concentration increases, while those with higher Ksp values precipitate later.

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