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Surface potential and surface tension of aqueous solutions of substituted salicylic acids

✍ Scribed by B. Kamieński; M. Paluch

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

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✦ Synopsis

5-bromosalicylic, 5-sulphosalicylic and 3-nitrosalicylic acids increase the negative potential of the air/water boundary. The first compound is the most active; it changes the potential by 270 mV at a concentration of 0@03 M (pH 2.1) and decreases the surface tension to 70.2 dyn/cm. The increase of potential is caused by the negative field of the bromine atom, which protrudes to the gaseous phase.

The surface-activity curves exhibit an inflexion point at a definite pH, from which the dissociation constants may be estimated.

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