Question Cu2+ was determined in a stream below the point at which runoff water from mine tailings had mixed with it. An instrumental method was used with quantitation employing the method of standard additions. In the procedure three 10.00 mL samples of river water were taken using a pipet and varying amounts of a standard solution of 5.7 ppm Cu added. Then deionized water was added to bring the volume of each solution to exactly 50.0 mL. These solutions gave intensity readings as follows: Flask number Added Standard Intensity 1 0.00 mL 12.52 2 5.00 mL 19.00 3 10.0 mL 24.13 a) Calculate the Cu2+ concentration in the original water sample and express your answer both in ppm and molarity. (4 points) b) Why is the standard addition method attractive as a method of choice in this case? (2 points)

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