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Name: MARK LOW YOONG NENG Student ID: 1507786 No. of Experiment: 8 Title of Experiment: Preparation and Studies of Potassium Tris(oxalate) Aluminate(III) Trihydrate, K 3 {Al(C 2 O 4 ).3H 2 O} Date of Experiment: 25/2/2016 Date of Submission: 3/3/2016 Name of Lecturer: DR LIM TM Name of Group Member: TAN YEE TING, TANG LER ERN Practical Group: P3
OBJECTIVE To prepare Potassium tris(oxalato)aluminate(III)trihydrate K 3 {Al(C 2 O 4 ).3H 2 O} and study its reactions. INTRODUCTION Aluminium occurs widely in nature as aluminosilicate minerals and as bauxite, Al 2 O 3 .xH 2 O from which the metal can be produced by electrolysis after dissolving in molten cryolite, Na 3 AlF 6 . The metal is mainly used in aluminium alloys. The organoaluminium compounds (e.g. Et 3 Al) are used in the catalysis involved in the polymerization of ethene. Group 13 (IIIA) of the Periodic Table includes the elements boron (B), aluminium (Al), gallium (Ga), indium (In), and thallium (Tl). The electronic configuration in ns 2 np 1 and the group valency is three. Aluminium (atomic number = 13) is present in the third period and contains empty 3d orbitals and favours the formation of complexes with six coordination number. It forms stable octahedral complexes with ligands such as 8-hydroxyquinoline which also known as ‘oxine’ (C 9 H 7 NO) and with the oxalate anion (C 2 O 4 2- ). In this experiment, you are to prepare an oxalate-aluminium(III) complex and study its reaction. Potassium tris(oxalato)aluminate(III) is a metal complex of iron with three oxalate ligands (C 2 O 4 2- ) bonded to every central metal atom. These ligands are bidentate, meaning that each of them binds to the metal atom at 2 different places. It has the chemical formula K 3 [Al(C 2 O 4 ) 3 ]·3H 2 O, and the three-dimensional structure propose in Figure 1 below.
Figure 1 Such complexes are often utilized in schools and universities to introduce various concepts such as ligand strength, metal complexes, and ligand replacement. Potassium tris(oxalato)aluminate(III) is hygroscopic and light sensitive in nature. In this experiment, we synthesized this fascinating compound through the addition of oxalic acid dihydrate and potassium oxalate monohydrate into the distilled water with aluminium hydroxide precipitate. APPARATUS Beaker, dropper, glass rod, vacuum filtration, electronic balance, hot plate, ice, filter funnel, conical flask, measuring cylinder, platinum wire, fume cupboard, test tubes, boiling tubes. MATERIALS 0.0105 mole Al 2 (SO 4 ) 3 .18H 2 O, distilled water, 5M NaOH solution, 0.0159 mole oxalic acid dehydrate, 0.0163 mole of potassium oxalate monohydrate, ethanol, dilute NaOH solution, dilute HCl solution, dilute sulfuric acid solution, dilute KMnO 4 .
PREPARATION

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