Answer to Question #144555 in Inorganic Chemistry for Prachi

Question

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.

Answer 1

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