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Thermodynamic ionization constants of 2,3-, 2,5-, 3,4-, and 3,5-dinitrophenols in aqueous solution at 25° C have been determined by a spectrophotometric method. The respective values found, expressed as p K, are 4.95 9 , 5.21 0 , 5.42 2 , and 6.69 2 . p K has also been determined potentiometrically for 2,3- and 3,5-dinitrophenols; the respective values obtained are 4.98 and 6.66. The experimental p K values for all six dinitrophenols are lower than the calculated values based on p K data for phenol and the mononitrophenols. Spectral absorption curves are presented for the ionized and unionized forms of the four dinitrophenols.

Ionization constants of 4 dinitrophenols in water at 25 C