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Unformatted text preview: Name: YiTien (Terry) Jou ID#: 16889971 TA: Sonja Peterson Date: 4/4/2011 Chemical Equilibrium References Adapted from "Chemistry with Computers" Vernier Software, Portland OR, 1997 & from Journal of Chemical Education Vol. 75, No. 12, December 1998 http://jchemed.chem.wisc.edu/Journal/Issues/1998/Dec/abs1628.html Objectives The objective of this lab is to determine experimentally the equilibrium constant, K c , for the following chemical reaction: +( ) + -( ) +( ) Fe3 aq SCN aq FeSCN2 aq . When Fe 3+ and SCN are combined, equilibrium is established between these two ions and the FeSCN 2+ ion. In order to calculate K c for the reaction, it is necessary to know the concentrations of all ions at equilibrium: [FeSCN 2+ ] eq , [SCN ] eq , and [Fe 3+ ] eq . We will prepare four equilibrium systems containing different concentrations of these three ions. The equilibrium concentrations of the three ions will then be experimentally determined. These values will be substituted into the equilibrium constant expression to see if K c is indeed constant. Chemical Table Name MF MW Density Iron(III) nitrate Fe(NO 3 ) 3 241.86 g/mol 1.68 g/cm 3 Potassium thiocyanate KSCN 97.18 g/mol 1.89 g/cm 3 Potassium chloride KCl 74.55 g/mol 1.98 g/cm 3 Sodium chloride NaCl 58.44 g/mol 2.16 g/cm 3 Epsom salt MgSO 4 7H 2 O 246.47 g/mol 1.68 g/cm 3 Sucrose C 12 H 22 O 11 342.30 g/mol 1.59 g/cm 3 Potassium bitartrate KC 4 H 5 O 6 , KHT 188.18 g/mol 1.05 g/cm 3 Sodium hydroxide NaOH 40.00 g/mol 2.13 g/cm 3 Phenolphthalein C 20 H 14 O 4 318.32 g/mol 1.28 g/cm 3 Equipment Part B. Part C. Beakers (50mL & 100mL) Volumetric flasks (250mL & 100mL) Test tubes Stir bar Stirring rod Vacuum Filtration Thermometer 125mL Erlenmeyer flask VIS-NIR spectrometer Graduated cylinder Cuvette Buret Name: YiTien (Terry) Jou ID#: 16889971 TA: Sonja Peterson Date: 4/4/2011 Procedures Part B....
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