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The problems involved in the measurement of hydrogen ion concentration in nonaqueous solutions are discussed, and a method is described whereby such measurements can be made potentiometrically. To circumvent the general difficulty of direct measurement in nonaqueous samples, the use of a dilution technique is presented in which the sample is diluted with benzene — isopropyl alcohol solvent, the hydrogen ion concentration of the solution is measured potentiometrically, and the hydrogen ion concentration of the original sample is estimated from an empirical correlation established experimentally for the type of material under consideration. A description of the technique of making potentiometric measurements in benzene — isopropyl alcohol medium is presented, and the limitations and advantages of the dilution method are discussed. In certain cases unreliable results may be obtained using the dilution method, and in these instances partial or complete titration of the sample is resorted to and the original hydrogen ion concentration is calculated. A notation for hydrogen ion concentration is defined for nonaqueous solutions to be used in place of pH notation used for aqueous solutions.
Shell Development Co., Emeryville, Calif.