When colorless solutions containing Fe³+ (aq) ions and SCN-

Last updated: 7/9/2022

When colorless solutions containing Fe³+ (aq) ions and SCN- (aq) ions are combined, a deep-red complex ion, FeSCN2+ (aq) quickly forms, as shown in the net ionic equation above. Which of the following explains the observation that adding a few additional crystals of KSCN(s) results in the red color of the solution becoming deeper? The added KSCN (s) dissolves, disturbing the charge balance in the solution, causing Fe(SCN), to precipitate as a red solid. A B Ⓒ Fe (aq) + SCN- (aq) FeSCN²+ (aq) Colorless Colorless Red D The added KSCN(s) dissolves, causing the solution to become saturated in SCN ions, which appear red at high concentrations. The added KSCN(s) dissolves, causing the reaction system to respond by producing more product to partially consume SCN- (aq) and reduce its concentration. The added KSCN(s) dissolves, causing the reaction system to respond by forming more Fe³+ ions, which have a deep orange color at high concentrations.