The concentration of Br^- ion in a sample of H₂O is 10 ppm. What mass of Br^- ion is present in 300.0 mL of H₂O, which has a density of 1.02 g/mL?

Question

Quizplus · Accepted Answer

First, calculate the mass of the 300.0 mL sample using the density: mass = volume × density = 300.0 mL × 1.02 g/mL = 306 g. Since the concentration of Br^- ion is 10 ppm (parts per million), it means there are 10 mg of Br^- ion per 1,000,000 mg of solution. For 306 g (or 306,000 mg) of solution, the mass of Br^- ion is (10 mg/1,000,000 mg) × 306,000 mg = 3.06 mg.

The Concentration of Br- Ion in a Sample of H2O

The Concentration of Br^- Ion in a Sample of H₂O