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Kstab ? chemistry (OCR) A2

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    ReputationRep:
    Hi, I was wondering if anyone knew the definition for Kstab - the stability complex?

    My CGP revision book says the 'Kstab of a complex ion is the equilibrium constant for the formation of a complex ion from its contituent ions in solution'
    It says you can find the Kstab for the formation of a complex ion from ions and for ligand substitution reactions.

    But my textbook says Kstab is the equilibrium constand for the ligand substitution of a complex ion with water ligands.

    I don't know which is right
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    ReputationRep:
    (Original post by Gemma2010)
    Hi, I was wondering if anyone knew the definition for Kstab - the stability complex?

    My CGP revision book says the 'Kstab of a complex ion is the equilibrium constant for the formation of a complex ion from its contituent ions in solution'
    It says you can find the Kstab for the formation of a complex ion from ions and for ligand substitution reactions.

    But my textbook says Kstab is the equilibrium constand for the ligand substitution of a complex ion with water ligands.
    2 h
    I don't know which is right
    Stability constants measure the relative stability of ligands in a complex ion

    For the complex ion:

    [Ni(NH3)6]2+ in solution there wil be some tendency for the ligands to exchange with water molecules:

    [Ni(NH3)6]2+ + H2O <==> [Ni(NH3)5(H2O)]2+ + NH3

    The equilibrium constant for this reaction is the stability constant:

    Kstab = [[Ni(NH3)5(H2O)]2+][NH3]/[[Ni(NH3)6]2+]
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    ReputationRep:
    (Original post by charco)
    Stability constants measure the relative stability of ligands in a complex ion

    For the complex ion:

    [Ni(NH3)6]2+ in solution there wil be some tendency for the ligands to exchange with water molecules:

    [Ni(NH3)6]2+ + H2O &lt;==&gt; [Ni(NH3)5(H2O)]2+ + NH3

    The equilibrium constant for this reaction is the stability constant:

    Kstab = [[Ni(NH3)5(H2O)]2+][NH3]/[[Ni(NH3)6]2+]
    Cheers

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