The coordiantion compound is synthesized from a reaction mixture of iron(II) amm

Question

The coordiantion compound is synthesized from a reaction mixture of iron(II) ammonium sulfate hexahydrate, Fe(NH4)2(SO4)2•6H2O, oxalic acid, H2C2O4, potassium oxalate, K2C2O4, and hydrogen peroxide, H2O2. In the first step, oxalate ion from oxalic acid precipitates the iron(II) ion as FeC2O4.

Fe(NH4)2(SO4)2·6H2O (aq) + H2C2O4 (aq) + + 2- (1) FeC2O4 (s) + 2NH4 (aq) +2H (aq) +2SO4 (aq) +6H2O(l)

In the second step, iron(II) is oxidized to iron(III) with the formation of the desired product by 1st treating the FeC2O4 precipitate with acid, and then adding an excess of oxalate ions, as potassium oxalate, for bonding to the iron(III) ion in the complex. Hydrogen peroxide, a mild oxidizing agent, oxidizes all iron(II) ions to iron(III) ions. The soluble hydrated potassium iron(III) oxalate compound forms light-sensitive emerald green crystals when a less polar solvent such as alcohol is added to the solution.

(2)

FeC2O4 (s) + K+(aq) + C2O42-(aq) + H2O2(aq) KwFex(C2O4)y(H2O)z (s) + ??????

This reaction is shown incomplete and unbalanced

Prepare the Iron(II) Solution. Measure about 1 g (± 0.001 g) of Fe(NH4)2(SO4)2•6H2O. Transfer this salt to a 200-mm (8 inch) test tube, and add 3 mL of deionized water and several drops of 6 M H2SO4.

1. (8 pts) Which of the following is the limiting reagent in this synthesis? Assume that everything proceeds as it should and justify your choice
a. Fe(NH4)2(SO4)2•6H2O b. H2O2 c. K2C2O4 d. H2SO4 e. ethanol

(6 pts) What are the primary oxidizing and reducing agents in this experiment?

(6 pts) Assume that you are given an old batch of hydrogen peroxide that has decomposed in storage. What color will your solution be when you reach the point where you need to add ethanol? Briefly explain your answer.

Explanation / Answer

This is Synthesis of light sensitive Potassium ferric oxalate trihydate. Which can be obtained in 2 steps. 1.formation of ferrous oxalate from iron(ll) ammonium sulphate hexahydrate + oxalic acid and oxidation by H2O2 and excess of oxalate, potassium oxalate to form K3Fe(C2O4) .3H20

balancedEquation --

K+ + FeC2O4 + H2O2 + C2O4 -2 ------- K3Fe(C2O4)3.3H20 + OH-

2. Primary oxidising agent is H2SO4 and other mild agent is H2O2 which itself gets reduced and iron(ll) is oxidised to iron(lll). Thus Fe acts as reducing agent.

Fe2+ ----- Fe+3 + 1e-

H2O2 +2e- ---- 2H+ ---- 2H2O

3. Old hydrogen peroxide will decompose in light and so oxidation of iron(ll) to iron(lll) ferric is slowed or just will not atall happen.

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