Expt2-Iron(III)Oxalate - EXPERIMENT 2 Synthesis of Potassium

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EXPERIMENT 2 Synthesis of Potassium Tris(oxalato)ferrate(III) Trihydrate Objective: Potassium tris(oxalato)ferrate(III) trihydrate [K 3 Fe(C 2 O 4 ) 3 ·3H 2 O] 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. I n t r o d u c t i o n : A chemical synthesis is the use of one or more chemical reactions to bring about the construction of a desired chemical product or products. The reasons for carrying out a chemical synthesis are varied. 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 large quantities, 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, maximizing the conversion of reactants to products is always a priority. In this experiment, you will synthesize the compound potassium tris(oxalato)ferrate(III) trihydrate [K 3 Fe(C 2 O 4 ) 3 ·3H 2 O] in a two-step process. The first step involves the reaction of ferrous ammonium sulfate hexahydrate [Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O] with oxalic acid (H 2 C 2 O 4 ): 4 2 2 2 2 (Pale green) Fe(NH 4 ) 2 (SO ) ·6H O( s ) + H C O 4 ( aq ) F e C 2 O 4 ·2H 2 O( s ) + (NH 4 ) 2 SO 4 ( aq ) + H 2 SO 4 ( aq ) + 4H 2 O( l ) (1) (Yellow) Where applicable, the colors of reactants and products are indicated in parentheses below their molecular formula. The iron(II) oxalate dihydrate (FeC 2 O 4 ·2H 2 O) produced in the Reaction (1) will be separated from the other products by decantation. In the second step, the iron(II) oxalate dihydrate will be converted to potassium tris(oxalato)ferrate(III) trihydrate [K 3 Fe(C 2 O 4 ) 3 ·3H 2 O] through reaction with oxalic acid, hydrogen peroxide (H 2 O 2 ), and potassium oxalate (K 2 C 2 O 4 ): 2 FeC 2 O 4 ·2H 2 O( s ) + H 2 C 2 O 4 ( aq ) + H 2 O 2 ( aq ) + 3 K 2 C 2 O 4 ( aq ) (Yellow) 2 K 3 Fe(C 2 O 4 ) 3 ·3H 2 O( s ) (2) ( G r e e n ) The potassium tris(oxalato)ferrate(III) trihydrate crystals then are separated from solution by vacuum filtration. Your objective is to prepare as great a yield of potassium tris(oxalato)ferrate(III) trihydrate as possible. To measure the effectiveness with which this objective is met, you will calculate the percent yield: 100 yield l theoretica ield y actual yield Percent × = ( 3 ) 2 – 1
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Experiment 2: Synthesis of Potassium Tris(oxalato)Ferrate(III) Trihydrate The theoretical yield is the calculated maximum amount of product that might be obtained under ideal 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 [K 3 Fe(C
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This note was uploaded on 10/25/2009 for the course CHEM 2090 at Cornell University (Engineering School).

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Expt2-Iron(III)Oxalate - EXPERIMENT 2 Synthesis of Potassium

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