Question- Calibration of a glass electrode gave a reading of 126.7 mV with saturated potassium hydrogen tartrate buffer standard (pH = 3.557) and a reading of -202.4 mV with 0.01 m borax buffer standard (pH = 9.139), both measured at 30°C.
1) What is the observed slope (mV/pH unit) of the calibration curve?
2) What is the theoretical slope at 30°C?
3) What is the electromotive efficiency to three significant figures?? Open the hint panel below for the definition of electromotive efficiency.
4) What is the pH of an unknown that gives a reading of 12.0 mV with this electrode at 30°C?
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