Question Four a) The concentration of As(III) in water can be determined by differential pulse polarography in IM HCI. The initial potential is set to-0.1 V versus the SCE, and is scanned toward more negative potentials at a rate of 5 mV/s. Reduction of As(III) to As(0) occurs at a potential of approximately -0.44 V versus the SCE. The peak currents, corrected for the residual current, for a set of standard solutions are shown in the following table. ip (µA) [As(III)] M 1.0 x 10-6 0.298 3.0 x 10-6 0.947 6.0 x 10-6 1.83 9.0 x 10-6 2.72 i. Plot the graph of [As (III)] vs ip and use linear regression to obtain the best fit line for the data obtained ii. What is the calibration curve equation. iii. What is the concentration of As (III) in a sample of water if the peak current under the same conditions is 1.37 µA? b) What is the principle of couloemetry

Question Four a) The concentration of As(III) in water can be determined by differential pulse polarography in IM HCI. The initial potential is set to-0.1 V versus the SCE, and is scanned toward more negative potentials at a rate of 5 mV/s. Reduction of As(III) to As(0) occurs at a potential of approximately -0.44 V versus the SCE. The peak currents, corrected for the residual current, for a set of standard solutions are shown in the following table. ip (µA) [As(III)] M 1.0 x 10-6 0.298 3.0 x 10-6 0.947 6.0 x 10-6 1.83 9.0 x 10-6 2.72 i. Plot the graph of [As (III)] vs ip and use linear regression to obtain the best fit line for the data obtained ii. What is the calibration curve equation. iii. What is the concentration of As (III) in a sample of water if the peak current under the same conditions is 1.37 µA? b) What is the principle of couloemetry

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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