Experiment #14 Determination of the Equilibrium Constant of

Experiment #14 Determination of the Equilibrium Constant of...

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Experiment 14 Part 1: Prepare Standard Solutions Solution ml .002M KSCN % Transmittance Absorbance (if needed) 1 2.0 59.6 0.225 4.0 2 3.0 49.0 0.310 6.0 3 4.0 37.7 0.424 8.0 4 5.0 30.3 0.518 10.0 5 6.0 24.5 0.611 12.0 4900 0.03 Part 2: Prepare and Measure Absorbance of Test Solutions a b c d e Solution % Transmittance Absorbance Initial (if needed) 1 5.0 1.0 79.0 0.101 1.0E-05 2 5.0 2.0 62.3 0.204 1.0E-05 3 5.0 3.0 50.2 0.299 1.0E-05 4 5.0 4.0 39.9 0.401 1.0E-05 5 5.0 5.0 32.0 0.480 1.0E-05 f g h I j Determination of the Equilibrium Constant for the Formation of FeSCN [FeSCN 2+ ] in .5M HNO 3 (M x 10 -5 ) Slope of [FeSCN 2+ ] vs Absorbance M -1 y-intercept of [FeSCN 2+ ] vs Absorbance ml .002M Fe 3+ ml .002M SCN - in .5M HNO 3 in .5M HNO 3 Fe 3+ moles 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12 0.000 0.100 0.200 0.300 0.400 0.500 0.600 0.700 f(x) = 0.05x + 0.03 R² = 1 [FeSCN2+] vs Absorbance (445nm) [FeSCN2+], M x 10-5
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Unformatted text preview: Absorbance Solution Initial HSCN moles (M) at equilibrium at equilibrium at equilibrium 1 2.00E-06 1.54E-05 1.54E-07 9.85E-06 1.85E-06 2 4.00E-06 3.64E-05 3.64E-07 9.64E-06 3.64E-06 3 6.00E-06 5.58E-05 5.58E-07 9.44E-06 5.44E-06 4 8.00E-06 7.66E-05 7.66E-07 9.23E-06 7.23E-06 5 1.00E-05 9.27E-05 9.27E-07 9.07E-06 9.07E-06 (from graph) k l m n Solution (mol) (mol) (mol) 1 1.85E-04 9.85E-04 0.50 42.3 2 3.64E-04 9.64E-04 0.50 52.0 3 5.44E-04 9.44E-04 0.50 54.3 4 7.23E-04 9.23E-04 0.50 57.3 5 9.07E-04 9.07E-04 0.50 56.3 52.5 [FeSCN 2+ ] FeSCN 2+ moles Fe 3+ moles SCN- moles [HSCN] eq [Fe 3+ ] eq [H + ] eq K eq K eq Average N 2+ 2.0 13.0...
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Experiment #14 Determination of the Equilibrium Constant of...

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