Effects of Aerosol-OT reversed micelles in carbon tetrachloride on acid-base indicator equilibria |
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Authors: | O A El Seoud Maria R Shimizu |
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Institution: | 1. Instituto de Quimica, Universidade de S?o Paulo, S? Paulo, Brazil
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Abstract: | ApparentpK a values of thymol blue solubilized in Aerosol-OT reversed micelles in carbon tetrachloride at 25 °C were determined spectrophotometrically. The effects of the Aerosol-OT concentration and the (water)/(surfactant)R ratio were investigated. The apparentpK a values increase as a function of increasing (R). All the measuredpK a values are less than that in water. The decrease ranges from 1.23 units (detergent=0.4 M,R=1.39) to 0.42 units (Aerosol-OT=0.6 M,R=9,25). These results are rationalized in terms of decreased hydronium ion activity in the micellar core due to its binding to the detergent SO3 ? groups. |
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