The formation of the iron(III) thiocyanate complex is represented by Fe ^ 3+ (aq)+…
CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
The formation of the iron(III) thiocyanate complex is represented by
Fe3+(aq)+SCN−(aq)⇌FeSCN2+(aq)ΔH∘=−8 kJ
Three separate stresses are applied to identical equilibrium mixtures.
I. Add Fe3+(aq) ions.
II. Decrease the temperature by 20K.
III. Dilute the solution by adding an equal volume of water.
Which of the following correctly ranks the stresses from greatest to least increase in the equilibrium concentration of FeSCN2+?
(a) II > I > III
(b) I > II > III
(c) III > I > II
(d) I > III > II