Which contains the greatest number of bromide ions? A)50 mL of 2.0 M KBr B)100 mL of 1.0 M BaBr₂ C)20 mL of 2.5 M FeBr₃ D)All contain the same number of chloride ions.

Question

Quizplus · Accepted Answer

The solution with the greatest number of bromide ions is the one with the highest molarity and greatest volume. 
Option A: 2.0 M KBr in 50 mL = 0.1 moles of KBr, which contains 0.1 moles of Br- ions.
Option C: 2.5 M FeBr3 in 20 mL = 0.05 moles of FeBr3, which contains 0.15 moles of Br- ions.
Option B: 1.0 M BaBr2 in 100 mL = 0.01 moles of BaBr2, which contains 0.02 moles of Br- ions. 
Therefore, Option B has the greatest number of bromide ions.

Which Contains the Greatest Number of Bromide Ions