Qualitative test of iron complex
One test tube contains K3[Fe(C2O4)3].3H2O, one test tube contains ferric ammonium sulfate.
To each test tubes, add a small amount of KSCN, then add more oxalic acid.
For the potassium complex, the following colour changes are observed: Light green -> Yellow (With KSCN) -> Dark Yellow (Oxalic acid)
For the Ferric ammonium sulfate, the following colour changes are obsserved: Light brown -> Blood red (KSCN) -> Yellow (Oxalic)
Qns: Deduce the relative stabilities of the Fe(III) oxalate, aqua and thiocyanate complexes. Explain the order of stability.