Abstract
Abstract Effects of sodium chloride, hydrochloric acid, and sodium hydroxide on the surface tension and foam formation of solutions of crystal violet and brilliant green were measured. By the addition of sodium chloride surface tension decreases and foam formation shows a maximum. In the cases of hydrochloric acid and sodium hydroxide, surface tension increases with the decrease of pH. and foam formation shows a maximum at about pH=2. These results were accounted by the change of surface activity of dye ion and the displacement of the equilibrium (micelle) \ightleftarrows (ion).
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