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Calibration of a glass electrode gave a reading of 126.5 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -73.7 mV with a 0.008695 m potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (pH = 7400), both measured at 30 C. What is the observed slope (mV/pH unit) of the calibration curve?

Calibration of a glass electrode gave a reading of 126.5 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -73.7 mV with a 0.008695 m potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (pH = 7400), both measured at 30 C. What is the observed slope (mV/pH unit) of the calibration curve?

Chemistry
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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What is 6, the electromotive efficiency, to three significant figures? What is the pH of an unknown that gives a reading of 19.1 mV with this electrode at 30 C? pH = %3D
Transcribed Image Text:What is 6, the electromotive efficiency, to three significant figures? What is the pH of an unknown that gives a reading of 19.1 mV with this electrode at 30 C? pH = %3D
Calibration of a glass electrode gave a reading of 126.5 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -73.7 mV with a 0.008695 m potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (pH = 7400), both measured at 30 C. What is the observed slope (mV/pH unit) of the calibration curve? slopeurd= -59.17 mV/pH What is the theoretical slope at 30 C? 0.984 mV/pH slopeeical= What is 8. the electromotive efficiency, to three significant figures?
Transcribed Image Text:Calibration of a glass electrode gave a reading of 126.5 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -73.7 mV with a 0.008695 m potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (pH = 7400), both measured at 30 C. What is the observed slope (mV/pH unit) of the calibration curve? slopeurd= -59.17 mV/pH What is the theoretical slope at 30 C? 0.984 mV/pH slopeeical= What is 8. the electromotive efficiency, to three significant figures?
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