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pH of complex ions

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    Hey guys, stuck on q.17(b)(ii) on this paper:

    http://www.edexcel.com/migrationdocu...e_20110131.pdf

    Only difference between the 2 I note is their charges, but how does this affect pH? Can't seem to understand this...any ideas?

    Cheers!
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    The acidity of some complexes is caused by the high charge density of the metal ion. So compare the charge density of Cr3+ with Cu2+ :yep:
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    (Original post by EierVonSatan)
    The acidity of some complexes is caused by the high charge density of the metal ion. So compare the charge density of Cr3+ with Cu2+ :yep:
    Cr3+ has the greater charge density of the 2, though how does Charge density affect pH? :eek:
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    (Original post by Next Level)
    Cr3+ has the greater charge density of the 2, though how does Charge density affect pH? :eek:
    Ah, well that's why you're struggeling :p:

    You need to look up 'acidity of aqua-complexes' this will do:

    http://www.chemguide.co.uk/inorganic...s/acidity.html
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    (Original post by EierVonSatan)
    Ah, well that's why you're struggeling :p:

    You need to look up 'acidity of aqua-complexes' this will do:

    http://www.chemguide.co.uk/inorganic...s/acidity.html
    Got it, easy peasy eh? I bet you are chemguide haha
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    (Original post by Next Level)
    Got it, easy peasy eh? I bet you are chemguide haha
    Nothing to do with me :nah:
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    (Original post by EierVonSatan)
    Nothing to do with me :nah:
    Haha well you certainly are as clever

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