Ionization constants of 4 dinitrophenols in water at 25 C
- 1 July 1960
- journal article
- Published by National Institute of Standards and Technology (NIST) in Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
- Vol. 64A (4) , 347-350
- https://doi.org/10.6028/jres.064a.034
Abstract
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 pK, are 4.959, 5.210, 5.422, and 6.692. pK has also been determined potentiometrically for 2,3- and 3,5-dinitrophenols; the respective values obtained are 4.98 and 6.66. The experimental pK values for all six dinitrophenols are lower than the calculated values based on pK data for phenol and the mononitrophenols. Spectral absorption curves are presented for the ionized and unionized forms of the four dinitrophenols.Keywords
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