equilibrium lab

# equilibrium lab - Chem 125 Dr. Neff Name: Olivia Nixon...

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Chem 125 Dr. Neff Name: Olivia Nixon Tuesday 8am Partners: Determination of an Equilibrium Constant Instructions: Each person is to submit an individual report, due at the beginning of the next lab period in Week 7. Absorbance of Standard Solutions Concentration of (FeSCN) 2+ in your stock solution: .00015 mol/L In the space below, show your calculation for the above concentration of (FeSCN) 2+ . M FeSCN = (.002mol/L * 3.0 mL * 1L/1000mL) / (40mL * 1L/1000mL) M FeSCN = .000006mL / .04L = .00015 M In the table below, record the results of your observations for each of the standard solutions you made. Title this table (in the space below) and use units where appropriate. Absorbance of Stock FeSCN Solution Tube No. [(FeSCN) 2+ ] Absorbance 1 .00003 .087 2 .00006 .216 3 .00009 .356 4 .00012 .504 5 .00015 .650 In the space below, show how you calculated the [(FeSCN) 2+ ] for standard tube #2: M 1 * V 1 = M 2 * V 2 .00015 mol/L * .002 L = M 2 * .005 L M 2 = .00006 Insert below the Excel graph you generated showing the linear relationship between concentration and absorbance of the [FeSCN 2+ ] standard solutions. The Fe 3+ + SCN - (FeSCN) 2+ Equilibrium System In the table below, record the results of your initial concentration calculations. Title this table (in the space below) and use units where appropriate. Initial Concentrations of Solutions

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## equilibrium lab - Chem 125 Dr. Neff Name: Olivia Nixon...

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