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EXPERIMENT 2Synthesis of Potassium Tris(oxalato)ferrate(III) TrihydrateObjective:Potassium tris(oxalato)ferrate(III) trihydrate [K3Fe(C2O4)3·3H2O] will be synthesized in a two-step process and the actual, theoretical, and percent yields of this compound will be determined.In addition, the number of waters of hydration will be confirmed by gravimetric analysis.Introduction:A chemical synthesis is the use of one or more chemical reactions to bring about the constructionof a desired chemical product or products. The reasons for carrying out a chemical synthesis arevaried. It might be the production of a useful substance not found in nature, plastics, for example,or the production of a substance found in nature but difficult or expensive to isolate in largequantities, such as ammonia. Then again, it might be the desire to create a substance with new,useful properties, say, a new medication. Whatever the motivation for the synthesis, maximizingthe conversion of reactants to products is always a priority.In this experiment, you will synthesize the compound potassium tris(oxalato)ferrate(III)trihydrate [K3Fe(C2O4)3·3H2O] in a two-step process. The first step involves the reaction offerrous ammonium sulfate hexahydrate [Fe(NH4)2(SO4)2·6H2O] with oxalic acid (H2C2O4):4 2222(Pale green)Fe(NH4)2(SO ) ·6H O(s) + H C O4(aq)→FeC2O4·2H2O(s) + (NH4)2SO4(aq) + H2SO4(aq) + 4H2O(l)(1)(Yellow)Where applicable, the colors of reactants and products are indicated in parentheses below theirmolecular formula.The iron(II) oxalate dihydrate (FeC2O4·2H2O) produced in the Reaction (1) will be separatedfrom the other products by decantation. In the second step, the iron(II) oxalate dihydrate will beconverted to potassium tris(oxalato)ferrate(III) trihydrate [K3Fe(C2O4)3·3H2O] through reactionwith oxalic acid, hydrogen peroxide (H2O2), and potassium oxalate (K2C2O4):2 FeC2O4·2H2O(s) + H2C2O4(aq) + H2O2(aq)+ 3 K2C2O4(aq)→(Yellow)2 K3Fe(C2O4)3·3H2O(s)(2)(Green)The potassium tris(oxalato)ferrate(III) trihydrate crystals then are separated from solution byvacuum filtration.Your objective is to prepare as great a yield of potassium tris(oxalato)ferrate(III) trihydrate aspossible. To measure the effectiveness with which this objective is met, you will calculate thepercent yield:100yieldltheoreticaieldyactualyieldPercent×=(3)2 – 1
Experiment 2: Synthesis of Potassium Tris(oxalato)Ferrate(III) TrihydrateThe theoretical yield is the calculated maximum amount of product that might be obtained underideal conditions from the reactants. In an experiment, the theoretical yield is seldom, if ever,reached. In this experiment, the theoretical yield is the maximum number of grams of product[K3Fe(C2O4)3·3H2