Calibration of a glass electrode gave a reading of 142.5 mV with saturated potas

Question

Calibration of a glass electrode gave a reading of 142.5 mV with saturated potassium hydrogen tartrate buffer standard (pH = 3.557) and a reading of -88.9 mV with 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454), both measured at 30 degree C. What is the observed slope (mV/pH unit) of the calibration curve? What is the theoretical slope at 30 degree C? What is beta, the electromotive efficiency to three significant figures ?? Open the hint panel below for the definition of electromotive efficiency. What is the pH of an unknown that gives a reading of 40.9 mV with this electrode at 30 degree C?

Explanation / Answer

Calibration of a glass electrode gave a reading of 142.5 mV with saturated potas

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