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Surface potential and surface tension of aqueous solutions of phenylarsonic acid and derivatives

✍ Scribed by B. Kamieński; E. Krauss

Publisher
Elsevier Science
Year
1965
Tongue
English
Weight
166 KB
Volume
10
Category
Article
ISSN
0013-4686

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✦ Synopsis

Phenylarsonic acid changes the potential at the free surface of 0.1 M KC1 from -23 to -275 mV and the surface tension from 72.3 to 67.7 dy/cm over the concentration range from 0.01 to 0.1 M. o-and p-methyl derivatives of this acid are far more active; they decrease the potential to about -600 mV at 0.06 M.

The influence of pH on the surface potential and the surface tension was also measured; phenylarsenic acid and its derivatives are strongly surface-active in acid media. The inflexion points of the curves indicate that the dissociation constants are approximately lo+.

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