Question

im mot sure how to start either of the problems, could someone please help

Questions 1. In carrying out this analysis, we are assuming that the fact Reaction (1) that occurred was given by Fe" (ap) + SCN (2) FeSCN () This reaction is an example of the formation of a complexion Complexions are stable lonic species formed between a central metal ion ( in this case), and surrounding anions or neutral molecules, called A ds. These ligands act as a wr donors to fill valence molecular orbitals of the metal ion. In this reaction, the thiocyanate ion (SCN) acts as a ligand. in water solutions, complex ons remain Unlike neutral lonic compounds, which form dissolved in water and do not precipitate. Can you propose another possible equilibrium between the Fellion and the SCN ion that might result in a different complex ion than FeSCN? Write a balanced chemical equation (BCE) and equilibrium constant expression (ECE) for this BCE: ECE: b. What product would you predict if conditions allowed you to add three SCN ions to combine with a single central Fe" ion? Write the balanced chemical equation (BCE) and equilibrium constant expression (ECE) for this reaction. BCE: ECE:

Answer 1

Fe³⁺ (aq) + SCN^- (aq) ⇌ FeSCN²⁺ (aq)

a.

B.C.E. Fe³⁺ (aq) + 2 SCN^- (aq) ⇌ [Fe(SCN)₂⁺](aq)

E.C.E. : K = [[Fe(SCN)₂⁺]] / [Fe³⁺ ] [SCN^- ]²

b.

B.C.E. Fe³⁺ (aq) + 3 SCN^- (aq) ⇌ [Fe(SCN)₃](s)

E.C.E. : K = [[Fe(SCN)₃]] / [Fe³⁺ ] [SCN^- ]³