Spectrophotometric Determination of the Thermodynamic pK Value of Picric Acid in Water at 25 °C.
Open Access
- 1 May 1963
- 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. 67 (3) , 241-246
- https://doi.org/10.6028/jres.067A.024
Abstract
The thermodynamic pK value of picric acid was determined spectrophotometrically in water containing hydrochloric acid to repress the ionization. The pK value 0.33 (K ≈ 0.46) was obtained from data at 450 mμ. Attempts to determine the pK value by potentiometric titrations of picric acid and by spectrophotometric measurements of picric acid solutions in the near-saturation range did not yield satisfactory results. The new pK value is compared with previously published values.Keywords
This publication has 2 references indexed in Scilit:
- Acid-base reactions in benzene and other organic solvents: Behavior of bromphthalein magenta with different classes of organic basesJournal of Research of the National Bureau of Standards, 1947
- Transmission measurements with the Beckman quartz spectrophotometerJournal of Research of the National Bureau of Standards, 1947