ChemLab2 - Evaluating the Equilibrium Constant for the...

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Evaluating the Equilibrium Constant for the Reaction of Iron (III) Ion with Thiocyanate Ion Kate Parrott Lab Partner: Elena Lombardo Lab Section: Monday at Noon
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Goal: The goal for this lab was to determine the equilibrium constant for the reaction between iron(III) and thiocyanate as seen in the following reaction: Fe 3+ + SCN -  FeSCN 2+ Data/Results: The first thing we did for this experiment was prepare the standard solutions, which meant knowing how to calculate the concentration of [FeSCN] 2+ in the solution and knowing how to read the absorbance of [FeSCN] 2+ in the solution. The absorbance was read by a spectroscope, and a blank was used to re-calibrate the instrument to prevent inaccurate calculations. From this information found, a standard curve could be calculated (Figure 1). Sample Calculation 1: Calculating the Molarity of [FeSCN] 2+ for Solution 2: M 1 V 1 = M 2 V 2 2.0x10-3 mol/L (1.0 mL) = x (50. mL) x = 4.0x10 -5 Table 1: Absorption as a Function of [FeSCN]
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This note was uploaded on 04/27/2008 for the course CHEM 115B taught by Professor Lillig during the Spring '08 term at Sonoma.

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ChemLab2 - Evaluating the Equilibrium Constant for the...

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