A Cu2+ solution obtained by dissolving a 3.1871-g penny in 500 mL of nitric acid has an absorbance of 0.342 at 620 nm in a 1.00 cm cell. The calibration curve prepared from Cu2* solutions of varying concentrations has a slope of 281.8 L/mol and a y-intercept of 0.0106. (a) Calculate the concentration of the solution in moles per liter. (b) Calculate the percent Cu by mass in the penny

A Cu2+ solution obtained by dissolving a 3.1871-g penny in 500 mL of nitric acid has an absorbance of 0.342 at 620 nm in a 1.00 cm cell. The calibration curve prepared from Cu2* solutions of varying concentrations has a slope of 281.8 L/mol and a y-intercept of 0.0106. (a) Calculate the concentration of the solution in moles per liter. (b) Calculate the percent Cu by mass in the penny

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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stion 10 of 13 > A chemist needs to create a series of standard Cu²+ (aq) solutions for an absorbance experiment. For the first standard, he uses a pipet to transfer 25.00 mL of a 2.49 M Cu²+ (aq) stock solution to a 250.0 mL volumetric flask, and he adds enough water to dilute to the mark. He then uses a second pipet to transfer 10.00 mL of that solution to a 50.00 mL volumetric flask, and he adds enough water to dilute to the mark. Calculate the concentration of the Cu²+ (aq) solution in the 50.00 mL volumetric flask. concentration: M
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