Experiment 18 - Experiment 18: Spectrophotometric...

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Experiment 18: Spectrophotometric Determination of an Equilibrium Constant Jacob Roll 4/18/07 Wednesday Yaofang Zhang
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PURPOSE The purpose of this experiment was to examine the properties of the reactions of weak acids and bases in equilibrium systems. Buffer solutions and indicators, which are the weak acids/bases, were used extensively in this experiment in determining the equilibrium constant K In . In order to get even more accurate calculations, MeasureNet and a spectrometer were also used to plot the absorption spectra of the different solutions. The absorption values from the plot helped find the pK In , which then helped in finding K In . In Chemistry 103, the effect of buffer solutions and what they are used for are being taught right now, as well as acid/ base reactions and there properties. PROCEDURE The procedure followed for this experiment can be found in the lab manual: Sprague, Alexander, Padolik, Steffel, Laboratory Experiments for First Year Chemistry, 5 th ed. pp. 18-5 to 18-9.
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Experiment 18 - Experiment 18: Spectrophotometric...

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