ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7

Published monthly
 

Potentiometric determination of dissociation constants of xanthic acids

V. Hejl and F. Pechar

Geologisches Institut der Tschechoslowakischen Akademie der Wissenschaften, Prag

 

Abstract: The dissocn. consts. and pH of xanthic acids were studied in relation to their structural formulas. These exptl. values, Kd × 104, of ethyl, propyl butyl, n-amyl, n-hexyl, n-heptyl, and n-octylxanthic acids (I) were calcd. from a modified Cook-Nixon equation (CA 44: 6229a): 34.0 ± 2, 8.52 ± 0.01, 5.3 ± 0.2, 3.6 ± 0.3, 2.6 ± 0.2, 2.4 ± 0.3, and 1.7 ± 0.3, resp. As the mol. wts. of the I are increased, the dissocn. consts. decrease. The increase of CH2 groups in the mol. of I affects directly the decrease of the dissocn. const., which graphically can be expressed by a hyperbola. The equation is: log(Kdt × 104) = a0 + a1x-1, where Kdt is the theoretical dissocn. const., x the no. CH2 groups plus 1, and a0 and a1 are coeffs. The definitive equation for the calcn. of the dissocn. const. is: log(Kdt × 104) = -0.134681 + 3.321683x-1. For the detn. of the dissocn. consts., dil. aq. solns. were applied because of their higher stability.

Full paper in Portable Document Format: 214a261.pdf (in Czech)

 

Chemical Papers 21 (4) 261–266 (1967)

Friday, March 29, 2024

IMPACT FACTOR 2021
2.146
SCImago Journal Rank 2021
0.365
SEARCH
Advanced
VOLUMES
European Symposium on Analytical Spectrometry ESAS 2022
© 2024 Chemical Papers