Calibration of a glass electrode gave a reading of 128.9 mv with saturated potassium hydrogen tartrate buffer standard (ph = 3.557) and a reading of -98.8 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?
(b) what is the theoretical slope at 30°c?
(c) what is β, 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 24.0 mv with this electrode at 30°c?