Your Safer Source for Science

Since 1977

Address P.O. Box 219 Batavia, IL 60510
Phone 800-452-1261
Fax 866-452-1436
Email flinn@flinnsci.com

Product 15944

By: The Flinn Staff

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-).

See more product details

Options:

(Select option to see volume pricing availability)

Product Details

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.