Answer to Question #172290 in General Chemistry for dfew

Question

General lab overview: In this experiment, iron (III) (Fe3+) reacts with thiocyanate ion (SCN-) to form the deep red complex ion, FeSCN2+. The intensity of the red color will tell you if [FeSCN2+] changes.

Direction--> Find the Reaction Equation for the Le Chatelier’s Principle Lab

Answer 1

Fe3+ + SCN-____ FeSCN2+

The FeSCN2+ complex that is formed as a result of reaction between iron(III) and thiocyanate ions has a very intense blood red color (or orange in dilute solution), allowing for easy detection and quantitative determination by spectrophotometry. Reactants ( Fe3+ and SCN-) are practically colorless.

Starting with known amounts of iron(III) and thiocyanate, and measuring the amount of FeSCN2+ ion formed at equilibrium, one can calculate the equilibrium amounts of iron(III) and thiocyanate ions. From a knowledge of the equilibrium amounts of all three ions, the equilibrium constant for the reaction may be calculated.