Open AccessInterfacial tension and hydrogen-ion concentration
Publication year - 1931
Publication title -
proceedings of the royal society of london. series b, containing papers of a biological character
Language(s) - English
Resource type - Journals
eISSN - 2053-9185
pISSN - 0950-1193
DOI - 10.1098/rspb.1931.0070
Subject(s) - surface tension , aqueous solution , dissociation (chemistry) , chemistry , ion , phosphate , benzene , crystallography , inorganic chemistry , chromatography , stereochemistry , thermodynamics , organic chemistry , physics
(1) Long chain carboxylic acids dissolved in benzene show regular changes in interfacial tension against aqueous "buffered" solutions as the hydrion concentration of these is altered. A fall in interfacial tension starts atp h 5·5 and extends over the range of 4·0p h 9·3 approximately, tending to vanish at this point. The curve is not identical with a dissociation curve, though it extends over the same range ofp h . For a givenp h the results are identical for phosphate and glycine "buffered" solutions, and for all acids investigated, except capric acid(C10 ), which shows an abnormality for phosphate. (2) Hexadecylamine shows similar changes, in the opposite sense between approximately the samep h range, which follow the dissociation curve of a weak base rather closely