# Experiment 34 (1).docx - Experiment 34: An Equilibrium...

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Experiment 34: An Equilibrium ConstantKaitlyn ChomkoTiernan Noll and Saajan VemalaChem 1310/DA8Professor Richard H. PerryBrandon02/23/18
Hypothesis:If the volumes and molar concentrations of NaSCNofFe(NO3)3are varied betweensolutions containing HNO3the absorbance and transmittance between the solutions will bedifferent.The more NaSCN in a solution, the lower the percent absorbance.A calibration curveof absorbance versus [FeNCS2+] can be used to determine the equilibrium molar concentration of[FeNCS2+].From there, the equilibrium constant is calculated by using this equation:Kc=FeNCS2+¿¿Fe3+¿¿SCN¿¿¿¿Materials and Methods:Source: Please refer to experiment 34: An Equilibrium Constant in Laboratory Manual forPrinciples of General Chemistry by J.A Beran on page 283There were no deviations in this experimentData:II Lab/excel ex- 34.xlsx
0.00E+005.00E-051.00E-041.50E-042.00E-042.50E-040.000.100.200.300.400.500.600.700.800.90f(x) = 3818.57x - 0.01Calibration Curve[FeNCS2+] (mol/L)Absorbance, A[FeNCS2+](mol/L)Absorbance,A0.00E+000.004.00E-050.1268.00E-050.3021.20E-040.4321.60E-040.5682.00E-040.778
Calculations:E11. Moles of SCN-(mol)Moles of SCN-(mol) = Molarity NaSCN (M) • Volume NaSCN (L)1.00E-06 = .001 • .001E12.[SCN-] (25 mL) (mol/L)[SCN-] (mol/L) =MolesSCN¿.025¿4.00E-05 =1.00E-06.025E.13 [FeNCS2+] (mol/L)[FeNCS2+] (mol/L) = [SCN-] (25 mL) (mol/L)4.00E-05 = 4.00E-05C.26 Moles of Fe3+

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Term
Fall
Professor
BERBECI
Tags
Mole, Kc, Molar concentration, SCN