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12 Nov 2019
1. A 5.00 ml urine sample was treated with reagents to generate color with phosphate ion, and then diluted to 100.0 ml. This unknown produced a %T 67.33%. One ml of a standard containing 0.0250 mg/ml of phosphate ion was added to 25.0 ml of the 100 ml of the diluted unknown solution above, the color was developed as above and diluted to 100 ml, followed by analysis. This standard-added solution produced a %T = 30.41%. Calculate the ppm of phosphate ion in the urine unknown. (10 pts) 2. Palladium (II) and gold(III) ions can be determined simultaneously by reacting both with a colorimetric reagent. The maximum absorption for the Pd complex occurs at 480 nm, while that for the Au complex is at 635 nm. Standards for both complexes were run at both wavelengths, yielding the following Epsilon values: Pd complex Au complex 480 nm 3.55 x 103 2.96 x 103 635 nm 5.64 x 10 1.45 x 104 25.00 ml of unknown was treated with excess of the complexing agent, and then diluted to 50.0 ml. The sample was then analyzed, yielding a %T = 29.31%T at 480 nm and 25.70%T at 635 nm. Calculate the ppm of both Pd(II) and Au(111) in the unknown sample. (10 pts)
1. A 5.00 ml urine sample was treated with reagents to generate color with phosphate ion, and then diluted to 100.0 ml. This unknown produced a %T 67.33%. One ml of a standard containing 0.0250 mg/ml of phosphate ion was added to 25.0 ml of the 100 ml of the diluted unknown solution above, the color was developed as above and diluted to 100 ml, followed by analysis. This standard-added solution produced a %T = 30.41%. Calculate the ppm of phosphate ion in the urine unknown. (10 pts) 2. Palladium (II) and gold(III) ions can be determined simultaneously by reacting both with a colorimetric reagent. The maximum absorption for the Pd complex occurs at 480 nm, while that for the Au complex is at 635 nm. Standards for both complexes were run at both wavelengths, yielding the following Epsilon values: Pd complex Au complex 480 nm 3.55 x 103 2.96 x 103 635 nm 5.64 x 10 1.45 x 104 25.00 ml of unknown was treated with excess of the complexing agent, and then diluted to 50.0 ml. The sample was then analyzed, yielding a %T = 29.31%T at 480 nm and 25.70%T at 635 nm. Calculate the ppm of both Pd(II) and Au(111) in the unknown sample. (10 pts)