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c16.docx - Post Lab 16 1 0.6 0.5 0.4 0.3 0.2 0.1 0 Vol 0.2...

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Post Lab 16 1) 0 0.1 0.2 0.3 0.4 0.5 0.6 Vol. 0.2 M HSCN Absorbance M FeSCN 2+ 2.00 mL 0.176 [4.03e-5] 3.00 mL 0.236 [5.76e-5] 5.00 mL 0.413 [9.04e-5] 2.00 mL 0.174 [4.04e-5] 3.00 mL 0.245 [5.83e-5] 5.00 mL 0.414 [9.06e-5] Molar Mass FeSCN 2+ = 113.93, Molar Mass HSCN = 59.09, V = 10 mL = .01 L Vol. 0.2 M HSCN M FeSCN 2+ Moles FeSCN 2+ 2.00 mL [4.03e-5] 4.03e-5 3.00 mL [5.76e-5] 5.76e-5 5.00 mL [9.04e-5] 9.04e-5 2.00 mL [4.04e-5] 4.04e-5 3.00 mL [5.83e-5] 5.83e-5 5.00 mL [9.06e-5] 9.06e-5 2) Vol. of 0.2 M HSCN Initial Moles HSCN 2.00 mL .001 3.00 mL .0015 5.00 mL .0025
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Fe 3+ in 5.00 mL .002 M Fe(NO 3 ) 3 = 1.00e-5 moles Fe 3+ 3) [Fe 3+ ] = (a-c)/V Vol. 0.2 M HSCN [Fe 3+ ] [HSCN] 5.00 mL 9.01e-4 .250 M 3.00 mL 9.42e-4 .150 M 2.00 mL 9.62e-4 .100 M 5.00 mL 9.01e-4 .250 M 3.00 mL 9.36e-4 .150 M 2.00 mL 9.59e-4 .100 M 4) Kc = [FeSCN 2+ ][H + ] [Fe 3+ ][HSCN] Volume 0.2 M HSCN K c 5.00 mL 65.02 3.00 mL 66.05 2.00 mL 65.02 5.00 mL 66.05 3.00 mL 65.02 2.00 mL 65.02 1) The best value for the equilibrium constant, Kc, is likely the average of all the Kc values, as despite the fact that these values all have different initial concentrations, the Kc values are very similar. 2) There are many sources of error that could have negatively affected the results of this lab. One of these
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