SYNTHESIZING A COORDINATION COMPOUND OF NICKEL II ION, AMMONIA, AND CHLORIDE ION.doc - Aidamarie Correa Chem 127 July 2 2012 SYNTHESIZING A COORDINATION

SYNTHESIZING A COORDINATION COMPOUND OF NICKEL II ION, AMMONIA, AND CHLORIDE ION.doc

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Aidamarie Correa Chem 127 July 2, 2012 SYNTHESIZING A COORDINATION COMPOUND OF NICKEL II ION, AMMONIA, AND CHLORIDE ION-PART II-PART 1 SYNTHESIS. INTRODUCTION In aqueous solution nickel ion Ni 2+ 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 so solid nickel(II) chloride is hydrated, has the formula [Ni(H 2 O) 6 ]Cl 2 , and is more properly called hexaquonickel(II) chloride. If ammonia is added to a solution of this salt, ammonia molecules compete with the water in bonding Ni 2+ 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 ( aq ) → [Ni(NH 3 ) 6 ]Cl 2 ( aq ) + 6 H 2 O ( l ) or, as a net ionic equation [Ni(H 2 O) 6 ] 2+ ( aq ) + 6 NH 3 ( aq ) → [Ni(NH 3 ) 6 ] 2+ ( aq ) + 6 H 2 O ( l ) In this net ionic equation, the product [Ni(NH 3 ) 6 ] 2+ is called hexamminenickel(II) ion.
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