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Equilbrium Constant - Nick Mooney Indira Silwal Equilibrium...

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Nick Mooney Indira Silwal March 24, 2008 Equilibrium Constant of An Acid-Base Indicator Introduction The purpose of this lab was meant for us learn how to use a pH meter and a UV-Vis spectrometer to determine equilibrium concentrations of Phenol Red. It was as well meant for us to learn how to calculate the equilibrium constant for Phenol Red. Procedure For the first part of this lab four indicator solutions were prepared, each with gradually decreasing concentration. In these four solutions the pH was kept constant while the concentration of indicator in buffer solution decreased from 10% to 8%, 5%, and 2%. Each of these solutions was scanned using the UV-Vis spectrometer. For part two, four solutions of the same concentration of indicator with varying pH values were prepared. These solutions were also scanned to obtain spectra. Data and Results Part 1: Varying Concentration QuickTime and a decompressor are needed to see this picture.
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