Question

Calculate the molar concentration of the Br⁻ ions in 0.76 M CaBr2(aq), assuming that the dissolved substance dissociates completely in solution.

Answer 1

CaBr2(aq) is an ionic compound which will have the releasing of 2 Br⁻ ions ions in water for every molecule of CaBr2 that dissolves.
CaBr2(s) --> Ca+(aq) + 2 Br⁻(aq)
            [Br⁻] = 0.76 mol CaBr2/1L × 2 mol Br⁻ / 1 mol CaBr2= 1.5 M
The answer to this question is [Br⁻] = 1.5 M.