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The Determination of Keq for FeSCN2+—College Level Classic General Chemistry Laboratory Kit

By: The Flinn Staff

Item #: AP7952

Price: $32.80

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College Level Classic General Chemistry Lab Kit: The Determination of Keq for FeSCN2+ is a two-part lab where you determine the equilibrium constant for the reaction of iron(III) ions with thiocyanate ions (SCN-).

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College Level Classic General Chemistry Experiment In this two-part lab, students determine the equilibrium constant for the reaction of iron(III) ions with thiocyanate ions (SCN-). In Part 1, a series of reference solutions containing the product ion, iron(III) thiocyanate (FeSCN2+), is prepared. Students then make up test solutions containing a fixed amount of iron(III) ions and different amounts of the SCN- ion. These solutions are analyzed in Part 2 using a colorimeter. The first set of solutions is used to generate a calibration curve of absorbance versus the concentration of FeSCN2+ ions. The second set of solutions is then analyzed and the FeSCN2+ ion concentration of each solution is determined. The students use the data to calculate the equilibrium constant for the reaction of iron(III) ions with thiocyanate ions (SCN-). Students gain valuable experience in the techniques of quantitative transfer, along with the process of colorimetric determination. Complete for 24 students working in pairs.

Specifications

Materials Included in Kit: 
Iron(III) nitrate, crystal, reagent, 50 g
Nitric acid solution, 1 M, 500 mL, 2
Potassium thiocyanate, 5 g, 2