3. You measure the weight fraction Cu in an alloy by dissolving 2.012 g of the material in 100.0 mLs of water and measuring the resulting dissolved Cu with atomic emission, obtaining a concentration of 342 mg Cu/L. The SD (standard deviation) of the weight is 0.0002 g, the SD of the volume is 0.15 mLs and the SD of the concentration is 2.2 mg Cu/L. The Cu content is calculated by Weight fraction Cu = (Cu concentration) x (Volume) / (Wt dissolved) a) Calculate the weight fraction of Cu b) Calculate the relative standard deviation of this weight fraction.

3. You measure the weight fraction Cu in an alloy by dissolving 2.012 g of the material in 100.0 mLs of water and measuring the resulting dissolved Cu with atomic emission, obtaining a concentration of 342 mg Cu/L. The SD (standard deviation) of the weight is 0.0002 g, the SD of the volume is 0.15 mLs and the SD of the concentration is 2.2 mg Cu/L. The Cu content is calculated by Weight fraction Cu = (Cu concentration) x (Volume) / (Wt dissolved) a) Calculate the weight fraction of Cu b) Calculate the relative standard deviation of this weight fraction.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

ChapterA1: Evaluation Of Analytical Data

Section: Chapter Questions

Problem A1.1QAP

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