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

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Experiment 6: Ligand Replacement Reactions Synthesis of [Ni(NH3)6]Cl2Objective: To synthesis [Ni(NH3)6Cl2compound.Introduction:In aqueous solution, nickel ion Ni2+ is surrounded by six water molecules which areactually 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 sixwater molecules into the crystals, and hence solid nickel (II) chloride is hydrated. It has theformula [Ni(H2O)6]Cl2 , and is more properly called hexaquonickel (II) chloride. Whenammonia is added to a solution of this salt, the ammonia molecules compete with the water inbonding Ni2+, and because the ammonia forms a stronger bond than water, the ammoniareplaces the water according to :[Ni(H2O)6]Cl2(aq)+ 6 NH3[Ni(NH3)6(Cl2)] (aq) + 6 H2Oor, as a net ionic equation :[Ni(H2O)6]2+(aq)+ 6 NH3[Ni(H2O)5(NH3)]2++ 6 H2OIn this net ionic equation, the product [Ni(NH3)6] 2+ is called the hexamminenickel (II) ion.

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