Pair each cation on the left with an anion on the right that...

Pair each cation on the left with an anion on the right that will form an insoluble compound with it and write a formula for the insoluble compound. Use each anion only once. $$\begin{array}{ll}\mathrm{Ag}^{+} & \mathrm{SO}_{4}^{2-} \\\mathrm{Ba}^{2+} & \mathrm{Cl}^{-} \\\mathrm{Cu}^{2+} & \mathrm{CO}_{3}^{2-} \\\mathrm{Fe}^{3+} & \mathrm{S}^{2-}\end{array}$$

Pair each cation on the left with an anion on the right that will form an insoluble compound with it and write a formula for the insoluble compound. Use each anion only once.
$$\begin{array}{ll}\mathrm{Ag}^{+} & \mathrm{SO}_{4}^{2-} \\\mathrm{Ba}^{2+} & \mathrm{Cl}^{-} \\\mathrm{Cu}^{2+} & \mathrm{CO}_{3}^{2-} \\\mathrm{Fe}^{3+} & \mathrm{S}^{2-}\end{array}$$

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Key Concepts

Solubility Rules

Solubility rules are guidelines that predict the solubility of ionic compounds in water. They help determine whether a compound will dissolve in water or form a precipitate. In problems like these, knowing which ions typically form insoluble compounds allows you to pair a cation with an anion that will produce a compound that does not dissolve significantly in water.

Ionic Compound Formula Writing

Ionic compound formula writing involves balancing the positive and negative charges of the ions to form a neutral compound. This requires identifying the charges on the cations and anions and determining the appropriate ratio in which they combine. The subscripts in the chemical formula are then adjusted accordingly to reflect the proper stoichiometry for a charge-neutral compound.

Precipitation Reactions

Precipitation reactions occur when two soluble salts react to form an insoluble product, known as a precipitate. Understanding these reactions involves recognizing how the combination of certain cations and anions, based on solubility rules, leads to the formation of a solid from an aqueous solution. This concept is key in predicting and writing equations for reactions where an insoluble compound is formed.

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