E2_SynK3Fe_C2O4_3_3H2O - EXPERIMENT 2 Synthesis of...

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11 EXPERIMENT 2 Synthesis of Potassium Ferric Oxalate Trihydrate Objective: The compound potassium ferric oxalate trihydrate [K 3 Fe(C 2 O 4 ) 3 · 3H 2 O] will be synthesized in a two-step process. The actual, theoretical, and percent yields of K 3 Fe(C 2 O 4 ) 3 · 3H 2 O will be determined. Introduction: 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 ferric oxalate 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 ): Fe(NH 4 ) 2 (SO 4 ) 2 · 6H 2 O( s ) + H 2 C 2 O 4 ( aq ) (Pale green) FeC 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 ferrous 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 ferrous oxalate dihydrate will be converted to potassium ferric oxalate 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 ) 2 K 3 Fe(C 2 O 4 ) 3 · 3H 2 O( s ) (2) (Green) The potassium ferric oxalate trihydrate crystals then are separated from solution by vacuum filtration. Your objective is to prepare as great a yield of potassium ferric oxalate trihydrate as possible. To measure the effectiveness with which this objective is met, you will calculate the percent yield:
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Experiment 2: Synthesis of Potassium Ferric Oxalate Trihydrate 12 100 yield l theoretica ield y actual yield Percent ! = (3) 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
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