Experiment 6

# Experiment 6 - Data Part 1 Calibration Curve Using Standard...

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Data: Part 1. Calibration Curve Using Standard Solutions Part 2. Solutions to Determine the Equilibrium Constant, K Solutions For The Determination Of The Equilibrium Constant Solution 0.200 M Fe(NO 3 ) 3 0.00200 M KSCN 0.1 M HNO 3 Absorption Measured [Fe(SCN) 2+ ] From Calibration Curve B-1 5.0 mL 1.00 mL 5.00 mL .055 .000051 B-2 5.0 mL 2.00 mL 4.00 mL .180 .000142 B-3 5.0 mL 3.00 mL 3.00 mL .302 .000232 B-4 5.0 mL 4.00 mL 2.00 mL .445 .00336 B-5 5.0 mL 5.00 mL 1.00 mL .537 .00040 B-1. [Fe 3+ ] [SCN - ] [Fe(SCN) 2+ ] Initial Concentration (M) .00091 .000182 0 Change in Concentration (M) -X -X +X Equilibrium Concentration (M) 8.59 * 10 -4 1.31 * 10 -4 .000051 K = 453 pK = -2.66 B-2. [Fe 3+ ] [SCN - ] [Fe(SCN) 2+ ] Initial Concentration (M) .00091 .000364 0 Change in Concentration (M) -X -X +X Equilibrium Concentration (M) 7.68 * 10 -4 2.22 * 10 -4 .000142 Solutions For Calibration Curve Solution 0.200 M Fe(NO 3 ) 3 0.00200 M KSCN 0.1 M HNO 3 [Fe(SCN) 2+ ] Absorption A-1 25.0 mL 0.00 mL 75.0 mL 0 .005 A-2 25.0 mL 1.00 mL 74.0 mL 2 * 10 -5 M .012 A-3 25.0 mL 2.00 mL 73.0 mL 4 * 10-5 M .036 A-4 25.0 mL 4.00 mL 71.0 mL 8 * 10-5 M .078 A-5 25.0 mL 6.00 mL 69.0 mL 12 * 10-5 M .135 A-6 25.0 mL 8.00 mL 67.0 mL 16 * 10-5 M .208 A-7 25.0 mL 10.00 mL 10.00 mL 2 * 10-4 M .272

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K = 833 pK = -2.92 B-3.
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