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FACULTY OF EDUCATION BACHELOR OF EDUCATION (HONS.) SCIENCE EDUCATION (MATHEMATICS) (ED249) CHM475: INORGANIC CHEMISTRY ASSIGNMENT: LABORATORY REPORT (EXPERIMENT 3) CLASS: ED2494C PREPARED BY: NURUL AINA SALWANI BINTI AHIRRUDIN (2019563945) NURUL HIDAYATI AMIRAH BINTI CHE AZMI (2019358995) PREPARED FOR: DR. MOHD SUFRI MASTULI
LAB REPORT EXPERIMENT 3 SYNTHESIS OF POTASSIUM TRIS(OXALATE)CHROMIUM(III) TRIHYDRATE, K 3 [Cr(C 2 O 4 ) 3 ].3H 2 O. PURPOSE The purpose of this experiment is to synthesize potassium tris(oxalate)chromium(III) trihydrate, K 3 [Cr(C 2 O 4 ) 3 ].3H 2 O. INTRODUCTION Preparation of new compounds is one of the most important aspects of any chemical research. This process if called synthesis. You will synthesis a special kind of compound called a coordination compound in this experiment. A coordination compound is a compound containing coordinate bonds, typically between a central atom and a number of other atoms or groups. Usually, transition metals readily form these coordination compounds resulting in bright colours. The most stable oxidation state of chromium is Chromium(III). It forms a number of complexes in which six monodentate ligands surround the cation octahedrally. In the above compound, two oxalate anions (bidentate ligands) and two water molecules coordinate the chromium cation to provide oxygen atoms at the corners of the octahedron. Two geometrical isomers exist for the complex ion, [Cr(C 2 O 4 ) 2 (H 2 O) 2 ], two (C 2 O 4 ) 2- ions [or two H 2 O molecules] can be on the same side of octahedron structure of the complex ion giving the cis -isomer or on the opposite sides giving trans -isomer.

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