Fatty acid-soap systems exhibit a minimum in surface tension as a function of pH. What causes the increase in surface tension with decrease in pH below the pH of minimum surface tension? O Increase in ionic repulsion in the adsorbed layer with decrease in pH reduces surfactant adsorption at the interface O Unionized fatty acid that is present in this region is less surface active O Increase in the level of acid soap with decrease in pH results in increase surface tension O Because of precipitation of unionized fatty acid in this region, the level of soluble surfactant decreases with decrease in pH

Fatty acid-soap systems exhibit a minimum in surface tension as a function of pH. What causes the increase in surface tension with decrease in pH below the pH of minimum surface tension? O Increase in ionic repulsion in the adsorbed layer with decrease in pH reduces surfactant adsorption at the interface O Unionized fatty acid that is present in this region is less surface active O Increase in the level of acid soap with decrease in pH results in increase surface tension O Because of precipitation of unionized fatty acid in this region, the level of soluble surfactant decreases with decrease in pH

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter22: Surfaces

Section: Chapter Questions

Problem 22.28E: The Young-Dupr equation, equation 22.16, is difficult to use directly because of the...

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