Question

Write the correct chemical formula of the precipitate that would form when mixing the two compounds NAOH and CaBr2

Answer 1

Explanation:

Precipitation reactions are sometimes called "double displacement" reactions. To determine whether a precipitate will form when aqueous solutions of two compounds are mixed:

1. Write down all ions in solution.

2. Combine them (cation and anion) to obtain all potential precipitates.

3. Use the solubility rules to determine which (if any) combination(s) are insoluble and will precipitate.

Examples:

a. What happens when Ba(NO3)2(aq) and Na2CO3(aq) are mixed?

Ions present in solution: Ba2+, NO3-, Na+, CO32-

Potential precipitates: BaCO3, NaNO3

Solubility rules: BaCO3 is insoluble (rule 5), NaNO3 is soluble (rule 1).

Complete chemical equation: Ba(NO3)2(aq) + Na2CO3(aq) BaCO3(s) + 2 NaNO3(aq)

Net ionic equation: Ba2+(aq) + CO32-(aq) BaCO3(s)