Methyl Red - A Chameleon That Reveals The Partition Between Two Phases As A Function Of pH An Extraction Experiment

M. JAZMÍN SILVERO,; FABIO E. MALANCA; CESAR G. GÓMEZ; JUAN CARLOS FRAIRE; ARGÜELLO, GERARDO ANÍBAL

The Chemical Educator

Año: 2012 vol. 17 p. 163 - 163

bstract: ?A picture is worth a thousand words,? and besides it is easier to remember. This work is based on that premise, and its main objective is to show that creating a strong visual impact on the student?s mind is a useful tool to teach important chemistry concepts. The activities proposed involve a biphasic medium composed of an aqueous solution at different pH levels and petroleum ether (60?80C), where an acid-basic indicator such as methyl red is employed to examine the phenomenon occurring in each phase, as it changes its color like a ?chameleon.? During the process, students are introduced to core concepts of physical chemistry through a solvent partition system. The experiment is suitable for both qualitative and quantitative analyses of the extraction process.