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By the use of a hydrogen electrode, two glass electrodes and a spectrophotometric method, the dissociation constants of 26 acids and bases in dimethylformamide have been determined. An acidity scale was defined from pH = 0 to pH = 16. The results obtained by the different methods are in good agreement. The hydrogen electrode can be used for voltammetry as well as for acid-base titrations in DMF. The beginning of the DMF acidity scale can be related to that of the water acidity scale by means of two non-thermodynamic assumptions which do not lead to the same result. Strehlow's approach seems more reasonable than the other.
Demange-Guerin
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