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A conventional general purpose glass electrode responds reversibly to hydrogen ion activity in picric acid-tetraethylammonium picrate and 1,3-diphenylguanidme-diphenylguanidinium perchlorate buffers in acetonitrile as solvent. From glass electrode measurements in these buffers, and from the dissociation constants of picric acid and 1,3-diphenylguanidine in acetonitrile, determined before by conductometric and spectrophotometric methods, the autoprotolysis constant of acetonitrile is found to be equal to 3 X 10 _27. It is shown that a conventional agar-potassium chloride salt bridge is not suitable for precise potential measurements in acetonitrile.

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