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EXPERIMENT 4 : PREPARATION OF POTASSIUM TRIS (OXALATO)ALUMINATE (III) TRIHYDRATE1)OBJECTIVEI.To synthesise potassium tris (oxalato) aluminate (III) trihydrate.2)INTRODUCTIONSynthesis is a process which substances combine to form new substances completely.In this experiment, we are synthesizing coordination compound. Coordinationcompound is the product of a lewis acid-base reaction in which neutral molecules oranions bond to central metal by coordinate covalent bonds. A coordinate covalentbond is a bond in which one atom supplies both electrons. this type of bonding isdifferent from a normal covalent bond in a bond which each atom supplies oneelectron.Aluminate is a compound containing an oxyanion of aluminium. It dissolves inboth bases and acids. When dissolved in bases it forms hydroxyaluminate ions in thesame way as aluminium hydroxide or aluminium salts. The hydroxyaluminate orhydrated aluminate can be precipitated and then calcined to produce anhydrousaluminates. The overall chemical equation: Al + 3KOH + 3H2C2O4• 2H2O →K3[Al(C2O4)3] • 3H2O + 6H2O + 3/2 H2The amount of coordination compound expected from a given mass of reactantscan be calculated and is called the theoretical yield. The actual mass of coordinationcompound synthesized called the actual yield. The actual yield is usually less than the