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Calculation of an Equilibrium Constant

# Calculation of an Equilibrium Constant - 0.00004...

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Calculation of an Equilibrium Constant Objective : To use the Measurenet spectrometer to determine the equilibrium constant of a chemical reaction. This is a study of chemical equilibrium. Experimental Data : A) Standard Solution 0.2 M Fe(NO3)3 0.001 M NaSCN 0.1 M HNO3 Absorbance Values 1 10.0 mL 1 mL 14 mL 0.105 2 10.0 mL 2 mL 13 mL 0.299 3 10.0 mL 3 mL 12 mL 0.399 4 10.0 mL 4 mL 11 mL 0.484 B) Test Solution 0.002 M Fe(NO3)3 0.002 M NaSCN 0.1 M HNO3 Absorbance Values 5 10.0 mL 2 mL 8 mL 0.13 6 10.0 mL 4 mL 6 mL 0.135 7 10.0 mL 6 mL 4 mL 0.504 8 10.0 mL 8 mL 2 mL 0.727 Sample Calculations : Solution 1: M1V1 = M2V2 (0.001M)(1 ml) = (25 ml)(M) 0.001 25 M= 4 x 10 ^ -5 [Fe3+] Solution 5: M1V1 = M2V2 (0.002 M)(10 mL) = (20 mL)(M) M = 0.001 [SCN-] Solution 5: M1V1 = M2V2 (0.002 M)(2 mL) = (20 mL)(M) M = 0.0002 [Fe3+ ] and [SCN-]: ICE box: Fe 3+ SCN- Fe(SCN)2 + Initial 0.001 0.0002 0 Change -0.0004 -0.00004

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Unformatted text preview: 0.00004 Equilibrium 0.001-0.00004 0.0002-0.00004 0.00004 0.00096 0.00016 0.00004 Results and Conclusions : A) Standard Solution [Fe(SCN)2+] Absorbance 1 4 x 10 ^ -5 0.105 2 8 x 10 ^ -5 0.299 3 1.2 x 10 ^ -5 0.399 4 1.6 x 10 ^ -5 0.484 B) Test Solution Absorbance [Fe(SCN)2+ ] [Fe 3+] initial [SCN-] ini tial [Fe 3+] equil. [SCN-] eq uil. K c 5 0.13 0.00004 0.001 0.0002 0.00096 0.00016 260.4 6 0.135 0.000045 0.001 0.0004 0.00096 0.00036 130.2 7 0.504 0.00016 0.001 0.0006 0.00084 0.00044 432.9 8 0.727 0.0002 0.001 0.0008 0.0008 0.0006 416.7 The average K c value comes out to be 310. Absorbance vs. [Fe(SCN) ] 0.1 0.2 0.3 0.4 0.5 0.6 0.00002 0.00004 0.00006 0.00008 0.0001 0.00012 0.00014 0.00016 0.00018 [Fe(SCN) ] Absorbance values...
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