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2001
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March
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In the Laboratory
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A Simplified Method for the Determination of Critical Micelle Concentration
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Mariano J. L. Castro
Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 428 Buenos Aires, Argentina
Hernán Ritacco
Departamento de Física, Facultad de Ingeniería, Universidad de Buenos Aires, 1063 Buenos Aires, Argentina
José Kovensky and Alicia Fernández-Cirelli
Departamento de Química Orgánica, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, 1428 Buenos Aires, Argentina
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March 2001
Vol. 78 No. 3
p. 347
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| Abstract |
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A simple and suitable method for the determination of critical micelle concentration of surfactants is described. The experiment was adapted from a traditional method and aims to familiarize undergraduate students with micellar solutions of amphiphilic molecules, versatile compounds exhibiting a wide range of applications. Surface tension is determined from the maximum bubble pressure required to form a bubble in a capillary tube just touching the liquid. The capillary is calibrated using liquids of known surface tension (at least 10 standard substances). Sodium dodecyl sulfate was selected to check the accuracy of the equipment.
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| Supplement |
Detailed instructions for students and notes for the instructor (information on the theory behind the experiment, necessary laboratory preparations, equipment needs, and g and DP values for various liquids) are available.
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 Contents |
JCE2001p0347W.doc (MS Word)
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| More Information |
Citation |
Castro, Mariano J. L.; Ritacco, Hernán; Kovensky, José; Fernández-Cirelli, Alicia. J. Chem. Educ. 2001 78 347.
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Keywords |
Laboratory Equipment / Apparatus; Laboratory Instruction; Physical Chemistry; Surface Science; Teaching / Learning Aids
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History |
Created:
Last Updated: |
February 6, 2001
August 31, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2001
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March
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347
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