# Equilibrium Constant Results Report.docx - Samrah Mitha...

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Samrah MithaCHEM 1310Section: DA7Lab Partner: Sophie Schuleke2/20/19Equilibrium Constant Results ReportData Tables:Table 1: A Set of Standard Solutions to Establish a Standardization CurveMolar concentration of Fe(NO3)3 : .2 MMolar concentration of NaSCN: .001 MStandard Solutions, Trials12345Volume of NaSCN (mL)1 mL2 mL3 mL4 mL5 mLMoles of SCN- (mol)1x10-6mol2x10-6mol3x10-6mol4.0x10-6mol5x10-6mol[SCN-] (25.0 mL)4.0x10-5M8.0x10-5M1.2x10-4M1.6x10-4M2.0x10-4M[FeNCS2+] (mol/L)4.0x10-5M8.0x10-5M1.2x10-4M1.6x10-4M2.0x10-4MAbsorbance (A).165.306.532.686.876Table 2: Absorbance for the Set of Test SolutionsMolar concentration of Fe(NO3)3: .002 MMolar concentration of NaSCN: .002 MTest Solutions, trial678910Volume of Fe(NO3)3(mL)5 mL5 mL5 mL5 mL5 mL
Moles of Fe3+, initial(mol)1x10-5mol1x10-5mol1x10-5mol1x10-5mol1x10-5molVolume of NaSCN(mL)1 mL2 mL3 mL4 mL5 mLMoles of SCN-, initial(mol)2.0x10-6mol4.0x10-6mol6.0x10-6mol8.0x10-6mol1.0x10-5molAbsorbance (A).378.432.575.787.791Table 3: Calculation of KcTest Solutions, trial678910[FeNCS2+],equilibrium, fromcalibration curve(mol/L)8.88x10-5M1.01x10-4M1.33x10-4M1.82x10-4M1.82x10-4MMoles of FeNCS2+atequilibrium (10mL)(mol)8.88x10-7M1.01x10-6M1.33x10-6M1.82x10-6M1.82x10-6MMoles of Fe3+reacted(mol)8.88x10-7M1.01x10-6M1.33x10-6M1.82x10-6M1.82x10-6 MMoles ofFe3+equilibrium(mol)9.11x10-6 mol8.99x10-6 mol8.67x10-6 mol8.18x10-6mol98.18x10-6mol[Fe3+] equilbriumunreacted (10mL)(mol/L)9.11x10-4 mol8.99x10-4 mol8.67x10-4 mol8.18x10-4mol98.18x10-4molMoles of SCN-reacted (mol)8.88x10-7M1.01x10-6M1.33x10-6M1.82x10-6M1.82x10-6 MMoles of SCN-equilibrium (mol)1.11x10-6 mol2.99x10-6 mol4.67x10-6 mol6.18x10-6mol8.18x10-6 mol[SCN-] equilibriumunreacted (10mL)(mol/L)1.11x10-4 mol2.99x10-4 mol4.67x10-4 mol6.18x10-4mol8.18x10-4 molKc=[FeNCS2+][Fe3+]876376330359273
[SCN-]Average Kc443Standard deviationof Kc245%RSD55.4 %RSDFigures: Figure 1:Graph: Calibration Curve0.00E+005.00E-051.00E-041.50E-042.00E-042.50E-0400.10.20.30.40.50.60.70.80.91f(x) = 4406.43x - 0.01R² = 1Absorbance (A) for Various Different Molar Concentrations of FeNCS2+Standard Solution AbsorbanceLinear (Standard Solution Absorbance)Test Solution Absorbance[FeNCS2+] (M) Absorbance (A) Figure 1:This graph shows a direct relationship between the absorbance values versus the concentrations of FeNCS2+. The relationship from this graph helps establish and determine a calibration curve from which the concentrations of the product can be established for the second part of this laboratory experiment.