Lab3_results - Michael Butler 10/22/2010 Experiment 3:...

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Unformatted text preview: Michael Butler 10/22/2010 Experiment 3: Determination of Metal-Ligand Composition Using The Mole-Ratio Method Michael Butler Georgia Tech Honor Challenge I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community. Date Submitted: 6/30/10 Lab Partner: Shivani Shah Lab Section/TA: 1312 A2/Lisa Vaughan 1 Michael Butler 10/22/2010 Student Notes Chem 1312 Exp. 3 Metal-Ligand Composition Using Mole Ratio Plot Please include these items in your Lab Report. I. COVER PAGE- 5pts II. DATA/RESULTS- 50 pts Table 1 Concentration of Stock Solutions (M): Fe(NH 4 ) 2 (SO 4 ) 2 • 6H 2 O 1.00E-03 2,2' 2,2’ bipyridine 1.02E-03 Table 2. (5 pt) (5 pt) (5 pt) Solution ml. iron (II) ml of 2,2' 2,2’ bipyridine Initial Iron (II) Conc. (mol/L) Initial 2,2' 2,2’ bipyridine Conc. (mol/L) Absorbance Mole Ratio (mol 2,2' 2,2’ bipyridine/mol Fe(II)) 1 1 1 1.00E-04 1.02E-04 0.251 1.02 2 1 1.5 1.00E-04 1.53E-04 0.382 1.53 3 1 2 1.00E-04 2.04E-04 0.513 2.04 4 1 2.5 1.00E-04 2.55E-04 0.590 2.55 5 1 3 1.00E-04 3.06E-04 0.704 3.06 6 1 4 1.00E-04 4.08E-04 0.755 4.08 7 1 5 1.00E-04 5.10E-04 0.728 5.10 8 1 6 1.00E-04 6.12E-04 0.711 6.12 9 1 7 1.00E-04 7.14E-04 0.735 7.14 10 1 8 1.00E-04 8.16E-04 0.745 8.16 Figure 1 . Plot of Absorbance vs. Mole Ratio : 10 pts for well made plot and correct ID of n, # of ligands. (- 4 pts if n not correct) PRINT OUT A FULL PAGE COPY 2 Michael Butler 10/22/2010 3 Michael Butler 10/22/2010 Sample Equations: (16pts-4 pt each) 1. Calculation of Molar Absorptivity, ε , of Metal-Ligand Product 2. Calculation of Product Concentration, [FeL n ], at equilibrium 3. Calculation of Ligand Concentration, [L] eq , at equilibrium 4. Calculation of Equilibrium Constant, K eq Table 3 Molar Absorptivity (L/mol • cm): 7550 3 pt Stoichiometric Ratio,n (mol 2,2' 2,2’ bipyridine/mol Fe) 3 3 pt Formation Constant, Kf: 7.638E+14 3 pt 4 1 1 2 max 7550 1 04 00 . 1 755 . ] [ : ,-- + = ×- = × = cm M cm M E b Fe A ty Absorbtivi Molar n Calculatio i ε ε ε M E L Fe cm cm M b A L Fe FeL ion Concentrat oduct eq tric stoichiome eq n 05 325 . 9 ] ) ( [ 1 7550 704 ....
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This note was uploaded on 10/21/2010 for the course CHEMISTRY 1312 taught by Professor Bottomley during the Summer '10 term at Georgia Institute of Technology.

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Lab3_results - Michael Butler 10/22/2010 Experiment 3:...

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