Multiple Choice
How many bromide ions are present in 65.5 mL of 0.210 M GaBr3 solution?
9. Solutions
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Which of the following solutions will have the highest concentration of bromide ions?
A
0.10 M NaBr
B
0.10 M CaBr2
C
0.10 M AlBr3
D
0.05 M MnBr4
Verified step by step guidance1
Identify the chemical formula for each compound to determine the number of bromide ions produced per formula unit. NaBr produces 1 bromide ion, CaBr2 produces 2 bromide ions, AlBr3 produces 3 bromide ions, and MnBr4 produces 4 bromide ions.
Calculate the concentration of bromide ions for each solution by multiplying the molarity of the solution by the number of bromide ions produced per formula unit. For example, for NaBr, the concentration of bromide ions is 0.10 M * 1 = 0.10 M.
Perform similar calculations for CaBr2, AlBr3, and MnBr4. For CaBr2, the concentration of bromide ions is 0.10 M * 2 = 0.20 M. For AlBr3, it is 0.10 M * 3 = 0.30 M. For MnBr4, it is 0.05 M * 4 = 0.20 M.
Compare the calculated concentrations of bromide ions for each solution to determine which has the highest concentration.
Conclude that the solution with the highest concentration of bromide ions is the one with the highest calculated value from the previous step.
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