I Data Report Sheet: Spectrophotemetric Determination of an Equilibrium Constant, Part A: Determination of a Calibration Carve: Std. 2 Stnd. 3 Stnd. 5 Stnd. 6 (H) 0.000127 |Fe(SCN)"] Column A 90 0 00060000 0 0 0.432 0.480 0.633 0.831 0.887 Absorbance Column E y%3D 4339.8x + 0.0258 Equaion of Calibration Line: Correlation Coefficient: 4339,8 Slope (br): Part B: Determination of K Expt. 1 Expt. 2 Expt. 3 Expt. 4 Expt. 5 0.00165 0.00165 0.00165 0.00165 0.00165 (Table I) 0.00033 66000 0 0.00132 0.00165 990000 (Table 1) (Fe(SCN)"leqsil. 0.290 0.524 0.803 1.024 Column F |Fe"leqail (Fe LFe(SČNY L ISCNJequi ((SCN FCS L 148.6799 135.1678 142.2659 141.8466 134.2843 Average K:140 448 6. Save Share II
I Data Report Sheet: Spectrophotemetric Determination of an Equilibrium Constant, Part A: Determination of a Calibration Carve: Std. 2 Stnd. 3 Stnd. 5 Stnd. 6 (H) 0.000127 |Fe(SCN)"] Column A 90 0 00060000 0 0 0.432 0.480 0.633 0.831 0.887 Absorbance Column E y%3D 4339.8x + 0.0258 Equaion of Calibration Line: Correlation Coefficient: 4339,8 Slope (br): Part B: Determination of K Expt. 1 Expt. 2 Expt. 3 Expt. 4 Expt. 5 0.00165 0.00165 0.00165 0.00165 0.00165 (Table I) 0.00033 66000 0 0.00132 0.00165 990000 (Table 1) (Fe(SCN)"leqsil. 0.290 0.524 0.803 1.024 Column F |Fe"leqail (Fe LFe(SČNY L ISCNJequi ((SCN FCS L 148.6799 135.1678 142.2659 141.8466 134.2843 Average K:140 448 6. Save Share II
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter16: Solubility And Precipitation Equilibria
Section: Chapter Questions
Problem 37P
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Expert Solution
Step 1
Equation of the calibration curve is y = 4339.8x + 0.0258 where
y = Absorbance
x = [FeSCN2+]
Experiment 1
y = 0.290
So,
0.290 = 4339.8x + 0.0258
x = 0.000061 M
Now,
Fe3+ + SCN- FeSCN2+
Fe3+ | SCN- | FeSCN2+ | |
Initial | 0.00165 | 0.00033 | 0 |
Change | -x | -x | x |
Equilibrium | 0.00165-x | 0.00033-x | x |
x = 0.000061 M
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