lab 2 in lab - Part A Data Table A Calibration Curve of Cu2...

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Part A: Data Table A. Calibration Curve of Cu 2+ Solutions and Unknown Stock Cu 2+ solution concentration .498 M Solution # Target volume of Cu 2+ , mL Actual volume of Cu 2+ , mL Target volume of H 2 O, mL Actual volume of H 2 O, mL [Cu 2+ ], M (calculated) Absorbance at 620 nm (measured) 1 1.20 1.20 4.80 4.80 .0996 .222 2 2.40 2.40 3.60 3.60 .199 .294 3 3.60 3.60 2.40 2.40 .299 .294 4 4.80 4.80 1.20 1.20 .398 .394 Equation of Trendline y = 0.518 x+ 0.172 R 2 = .887 Unknown # 1 Absorbance at 620 (measured) .222 [Cu 2+ ] (calculated) .0996 M Lab Question 2a. Would you predict the absorbance of Solution 2 to be greater than or less than that of Solution 1? greater than less than the same cannot tell Lab Question 2b. Why? [Cu 2+ ] is higher in solution 2 so less light is absorbed [Cu 2+ ] is higher in solution 2 so more light is absorbed [Cu 2+ ] is lower in solution 2 so more light is absorbed
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[Cu 2+ ] is lower in solution 2 so less light is absorbed cannot tell from the information given Part B: Data Table B. Preparation of a Cu 2+ Solution from solid CuSO 4 ·5H 2 O Target [Cu 2+ ] from Part A, M Target Mass CuSO 4 ·5H 2 O, g Actual Mass CuSO 4
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