Question

31. Give the balanced equations for reactions of aqueous ammonia with the following:
(a) Iron(III) chloride

Answer 1

• When ammonium hydroxide is treated with iron(III) chloride solution, a reddish brown ferric hydroxide precipitate forms, which is insoluble in excess of ${\mathrm{NH}}_4\mathrm{OH}$.
• ${\mathrm{FeCl}}_3\left(\mathrm{aq}\right)+3{\mathrm{NH}}_4\mathrm{OH}\left(\mathrm{aq}\right)\to \mathrm{Fe}{\left(\mathrm{OH}\right)}_3\left(\mathrm{s}\right)\downarrow +3{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{aq}\right)$