Ferum (III) thiocyanate [Fe(SCN)3] dissolves readily in water to give a red solution. The red colour is due to the presence of hydrated FeSCN2+ ion. The equilibrium between undissociated FeSCN2+ and the Fe3+ and SCN- ion is given by:
|
FeSCN2+ (aq) |
« Fe3+ (aq) | + SCN-(aq) |
|
Red |
Pale yellow |
Colourless |
What happens if we
add some sodium thiocyanate (NaSCN) to this solution?