Equlibirum - John Warwick Lab AI Amanda Le Sueur...

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John Warwick Lab AI: Amanda Le Sueur April 19, 2011 Equilibrium Results The results for test tubes 1-5 below (table 1) shows how the molar absorptivity constant was found for . Table 1: Test tubes 1-5 Test Tube Vol. M Vol. of 1 M KSCN Vol. of 0.1 M Equili brium Absor bance at 450 nm 1 1.0 mL 5.0 mL 4.0 mL 1E-5 0.079 8 2 2.0 mL 5.0 mL 3.0 mL 2E-5 0.168 7 3 3.0 mL 5.0 mL 2.0 mL 3E-5 0.257 7 4 4.0 mL 5.0 mL 1.0 mL 4E-5 0.342 6 5 5.0 mL 5.0 mL 0.0 mL 5E-5 0.430 6 Chart 1: Absorbance vs. Concentration of The data was then plotted onto a graph (chart 1) by absorbance vs. concentration of . A linear regression was completed in order to obtain an equation for the best-fit line and then consequently the slope. The slope of the line was used to calculate the molar absorptivity using beer’s law, shown below in example 1: (1) The results for test tubes 6-10 indicate the initial concentrations of the reactant, observed absorbencies, and the calculated equilibrium concentrations for each solution (table 2). Table 2: Test tubes 6-10 Tes t Tube Initial Initi al Absorb ance Final V alue of K 6 3.571E 3.57 0.2249 2.569E 2
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-4 M 1E-4 M -5 M 33.9 7 3.571E -4 M 7.14 3E-4 M 0.2861 3.268E -5 M 1 48.1 8 3.571E -4M 1.07 1E-3 M 0.4057 4.634E -5 M 1 48.9 9 7.143E -4 M 3.57 1E-4 M 0.6119 6.989E -5 M 3 77.8 10 7.143E -4 M 7.14 3E-4 M 0.5798 6.623E -5 M 1 57.7 In table 2, the initial concentrations were calculated according to the example (2) shown below for tube 6: (2) The final was calculated according to example equation (3) for tube 6 using the molar
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