In solution, potassium oxalate completely dissociates into potassium ions and ox

Question

In solution, potassium oxalate completely dissociates into potassium ions and oxalate ions. K2C2O4 (s) 2 K+ (aq) + C2O42- (aq)

When a solution with an excess of oxlate ions is added to the solid iron(II) oxalate dihydrate, each formula unit of iron(II) oxalate reacts with another oxalate ion to form a soluble complex ion with the formula Fe(C2O4)22-.  

Part A - The formation of a complex ion.

Write a balanced net ionic equation for the reaction of iron(II) oxalate dihydrate with oxalate ions to form the complex ion. Include phases in your equation.

FeC2O4(s)+C2O42(aq)Fe(C2O4)22(aq)

FeC2O4(s)+C2O42(aq)Fe(C2O4)22(aq)

Explanation / Answer

K2C2O4 (aq) = 2K+ (aq) + C2O42- (aq)

2FeC2O4 •2H2O(s) + H2O = 2FeC2O4 (aq)

So, net ionic equation for the complex formation is

  2FeC2O4 (aq) + C2O42- = [Fe(C2O4)2-] (aq)

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