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Pipet 2.0 mL of the 10 ppm standard quinine sulfate solution into a 25-mL

volumetric flask, add 1.0 mL 0.05 M NaBr (or other bromide salt), and fill to the mark with 0.05 M H2SO4. Prepare four more solutions with 2.0 mL of 10 ppm quinine in each and add 2.0-, 4.0-, 8.0-, and 16.0-mL portions of NaBr.

How do you find the concentration of Br in the 5 solutions?

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