If a glass electrode calibrated in aqueous pH standards is used to measure H+ concentration in aqueous glycol solutions the result will be in error due to the large change in solvent properties. Based on strong acid – strong base titrations in glycol solutions it is possible to calibrate glass electrodes. The titration does not only give the calibration constant for the electrode, but also the autoprotolysis constant for the solvent can be determined. The calibration method makes it possible to determine acid constants in glycol by potentiometric titration.

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