calculation of an equilibrium constant

# calculation of an equilibrium constant - Date Performed...

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Date Performed: 2/16/06 Name: Ronald Lampkins Date Submitted: 2/23/06 Partner: Jason Herrala Instructor: Shengliang Zhao Calculation of an Equilibrium Constant Objectives: To use MeasureNet spectrometer to determine the equilibrium constant of a chemical system. This experiment is a study of chemical equilibrium. Experimental Data: Part A Solution Absorbance Value of 447 nm. 1 .153 2 .163 3 .318 4 .798 Part B Solution Absorbance Value of 447 nm. 5 .036 6 .174 7 .378 8 .560 Sample Calculations: Part A Molarity of SCN - = M 1 V 1 = M 2 V 2 (0.001 M)(1 mL) = (x)(25 mL) X = 4.0 x 10 -5 M Part B Molarity of Fe +3 initial = M 1 V 1 = M 2 V 2 (0.002 M)(10 mL) = (x)(20 mL) X = 1.0 x 10 -3 M Molarity of SCN - initial = M 1 V 1 = M 2 V 2 (0.002 M)(2 mL) = (x)(20 mL) X = 2.0 x 10 -4 M

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Molarity of Fe +3 equilibrium (1.0 x 10 -3 ) – ( 4.3 x 10 -5 ) = 9.6 x 10 -4 M Molarity of SCN - equilibrium (2.0 x 10 -4 ) – (4.3 x 10 -5 ) 1.6 x 10 -4 M K c = K c = [4.3 x 10 -5 ] / [9.6 x 10 -4 ][1.6 x 10 -4 ] K c Solution 5= 280
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## This note was uploaded on 03/29/2008 for the course CHEM 1045 taught by Professor Pgamateis during the Fall '08 term at Virginia Tech.

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calculation of an equilibrium constant - Date Performed...

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