Calibration of a glass electrode gave a reading of 145.7 mV with 0.05 m potassiu

Question

Calibration of a glass electrode gave a reading of 145.7 mV with 0.05 m potassium hydrogen phthalate buffer standard (pH = 4.015) and a reading of -53.5 mV with 0.008695 potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (pH = 7.400), both measured at 30°C.

(a) What is the observed slope (mV/pH unit) of the calibration curve?

__________ mV/pH

(b) What is the theoretical slope at 30°C?

(c) What is , the electromotive efficiency to three significant figures?? Open the hint panel below for the definition of electromotive efficiency.

(d) What is the pH of an unknown that gives a reading of 38.5 mV with this electrode at 30°C?

Explanation / Answer

Calibration of a glass electrode gave a reading of 145.7 mV with 0.05 m potassiu

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