218636808-Potassium-Trihydrate.pdf - SYNTHESIS OF POTASSIUM...

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SYNTHESIS OF POTASSIUM TRIS(OXALATO) CHROMIUM(III) TRIHYDRATE : K3[CR(C2O4)3].3H2O ABSTRACT The aim of this experiment is to synthesize potassium tris(oxalato)chromium (III) via the addition of oxalic acid and potassium dichromate, K2Cr2O7to form a reagent. It will then being added with potassium oxalate monohydrate, K2C2O4.H2O after a few minutes of cooling process from previous reactions. A dark green precipitate will be formed after several process and it will be dried in the oven and a total of 1.23g will be obtained. Later, the theoretical mass and the percent yield will be calculated. Precipitate obtained will be kept in the vial to be used in next experiment. INTRODUCTION Potassium tris(oxalato)chromium (III) is a metal complex of iron with three oxalate ligands (C2O42-) bonded to every central metal atom. These ligands are bidentate, meaning that each of them binds to the metal atom at two different places. It has the chemical formula K3[Cr(C2O4)3]·3H2O, and the three-dimensional structure proposed in Figure 1. Potassium tris(oxalato)ferrate (III) is hygroscopic and light sensitive in nature. Figure 1: 3-dimensional structure of potassium tris(oxalato)chromium (III) In this experiment,thedesired product was produced in the form of dark green precipitate. The oxalic acid utilized in the first step of this reaction scheme can be synthesized by hydrolyzing cyanogen1

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