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pH of complex ions

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

http://www.edexcel.com/migrationdocuments/QP%20GCE%20Curriculum%202000/January%202011%20-%20QP/6CH05_01_que_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! :smile:
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:
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/complexions/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/complexions/acidity.html


Got it, easy peasy eh? :biggrin: I bet you are chemguide haha
Original post by Next Level
Got it, easy peasy eh? :biggrin: I bet you are chemguide haha


Nothing to do with me :nah:
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Nothing to do with me :nah:


Haha well you certainly are as clever :wink:

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