SKTExperiment 6.docx - Experiment 6 Ligand Replacement...

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Experiment 6: Ligand Replacement Reactions Synthesis of [Ni(NH3)6]Cl2 Objective : To synthesis [Ni(NH 3 ) 6 Cl 2 compound. Introduction: In aqueous solution, nickel ion Ni2+ is surrounded by six water molecules which are actually bonded to the central metal ion. This complex is called the hexaquonickel (II) ion. When aqueous nickel chloride is precipitated from solution, the nickel ions carry their six water molecules into the crystals, and hence solid nickel (II) chloride is hydrated. It has the formula [Ni(H2O)6]Cl2 , and is more properly called hexaquonickel (II) chloride. When ammonia is added to a solution of this salt, the ammonia molecules compete with the water in bonding Ni2+, and because the ammonia forms a stronger bond than water, the ammonia replaces the water according to : [Ni(H 2 O) 6 ]Cl 2 (aq) + 6 NH 3 [Ni(NH 3 ) 6 (Cl 2 )] (aq) + 6 H 2 O or, as a net ionic equation : [Ni(H 2 O) 6 ] 2+ (aq) + 6 NH 3 [Ni(H 2 O) 5 (NH 3 )] 2+ + 6 H 2 O In this net ionic equation, the product [Ni(NH3)6] 2+ is called the hexamminenickel (II) ion.

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