Question

Which of the following solutions will have the highest concentration of bromide ions?

O 0.05 M CaBr₂
O All of these solutions have the same concentration of bromide ions.
O 0.10 M NaBr
O 0.10 M AlBr₃
O 0.10 M MgBr₂

Answer 1

The solution with the highest concentration of bromide ions is 0.10 M AlBr₃, which produces 0.30 M Br⁻ ions.

Step-by-step explanation:

The solution with the highest concentration of bromide ions can be determined by considering the stoichiometry of the dissolution of each compound in water. To compare the bromide ion concentrations in each solution, we need to account for how many bromide ions are produced per formula unit of the compound that dissolves.

• 0.05 M CaBr₂ produces 0.10 M Br⁻ ions since each CaBr₂ yields two Br⁻ ions.
• 0.10 M NaBr produces 0.10 M Br⁻ ions because each NaBr yields one Br⁻ ion.
• 0.10 M AlBr₃ produces 0.30 M Br⁻ ions since each AlBr₃ yields three Br⁻ ions.
• 0.10 M MgBr₂ produces 0.20 M Br⁻ ions as each MgBr₂ yields two Br⁻ ions.

Thus, the 0.10 M AlBr₃ solution will have the highest concentration of bromide ions.