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Calibration of a glass electrode gave a reading of 139.1 mV with a 0.05 m potassium dihydrogen citrate buffer standard ( pH = 3.766), and a reading of -75.5 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454). 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 139.1 mV with a 0.05 m potassium dihydrogen citrate buffer standard ( pH = 3.766), and a reading of -75.5 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454). 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
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Calibration of a glass electrode gave a reading of 139.1 mV with a 0.05 m potassium dihydrogen citrate buffer standard ( pH = 3.766), and a reading of -75.5 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454). both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed= mV/pH What is the theoretical slope at 30 *C? slope theoretical What is B, the electromotive efficiency, to three significant figures? B= What is the pH of an unknown that gives a reading of 50.2 mV with this electrode at 30 "C? mV/pH
Transcribed Image Text:Calibration of a glass electrode gave a reading of 139.1 mV with a 0.05 m potassium dihydrogen citrate buffer standard ( pH = 3.766), and a reading of -75.5 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454). both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed= mV/pH What is the theoretical slope at 30 *C? slope theoretical What is B, the electromotive efficiency, to three significant figures? B= What is the pH of an unknown that gives a reading of 50.2 mV with this electrode at 30 "C? mV/pH
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