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chem lab exp 8 (ii)

chem lab exp 8 (ii) - Norkhairin Yusuf Experiment 8...

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Norkhairin Yusuf Experiment 8 – 02/09/09 Chemistry Principle II lab Paul Madden Purpose: To determine the room temperature equilibrium constant for the reaction between Fe 3+ , ferric or iron(III) ion, and SCN - , thiocyanate ion, to form the complex ion, FeSCN 2+ , ferric thiocyanate ion in an acidic aqueous solution by using visible spectroscopy. Procedure: The procedure of this experiment is referred to the lab procedure of experiment #8: Spectroscopic Determination of the Equilibrium Constant for Fe 3+ (aq) + SCN - (aq) FeSCN 2+ (aq). Data Analysis: Table 1: Concentration and Absorbance Data A B C D E F G Trial mL Fe 3+ mL SCN - [Fe 3+ ] o [SCN - ] o %T A 1 5 100 4.76 X 10 -3 1.90 X 10 -4 41.0 0.388 2 6 100 5.66 X 10 -3 1.89 X 10 -4 37.6 0.424 3 7 100 6.54 X 10 -3 1.87 X 10 -4 35.2 0.454 4 8 100 7.41 X 10 -3 1.85 X 10 -4 33.4 0.478 5 9 100 8.26 X 10 -3 1.83 X 10 -4 31.8 0.498 6 10 100 9.09 X 10 -3 1.82 X 10 -4 30.4 0.516 7 11 100 9.91 X 10 -3 1.80 X 10 -4 29.2 0.534 8 12 100 1.07 X 10 -2 1.79 X 10 -4 28.4 0.546 9 13 100 1.15 X 10 -2 1.77 X 10 -4 28.0 0.554 10 14 100 1.23 X 10 -2 1.75 X 10 -4 27.2 0.564
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Norkhairin Yusuf Experiment 8 – 02/09/09 Chemistry Principle II lab Paul Madden
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