Experiment 10 - Trevor Austin December 2 2004 Experiment#10...

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Trevor Austin December 2, 2004 Experiment #10: Chemical Equilibrium: Determination of an Equilibrium Constant
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Experiment #10: Chemical Equilibrium: Determination of an Equilibrium Constant A. SUMMARY In this experiment we evaluated the equilibrium constant for adding an iron(III) solution to a thiocyanate solution to form thiocyanoiron(III). When the iron(III) is added to thiocyanate it does not react to completion, instead ions of the product and reactants can be found in the final solution. In the experiment we measured the absorbance of blue light solutions of different concentrations. From this data an equilibrium constant will be calculated in the calculations section. B. RESULTS Trial (#) Trans (%T) Absorbance 1 73.31 0.135 2 80.18 0.096 3 63.59 0.197 4 53.85 0.269 Standard Solution 8.65 1.063 C. GRAPHS AND CALCULATIONS Equilibrium reaction: Fe3+ (aq) + SCN- (aq) FeSCN2+ (aq) 1. Calculate initial concentration of Fe3+. [Fe3+]i = ((Fe(NO3)3) mL / total mL) * (0.0020 M) [Fe3+]i = (5 mL / 10 mL) * 0.0020 M [Fe3+]i = 0.0010 M 2. Calculate the initial concentration of SCN-, based on its dilution by Fe(NO3)3
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