[Next Level]

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!

[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⁺

[Next Level]

(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⁺

Cr3+ has the greater charge density of the 2, though how does Charge density affect pH?

[EierVonSatan]

(Original post by Next Level)
Cr3+ has the greater charge density of the 2, though how does Charge density affect pH?

Ah, well that's why you're struggeling

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

http://www.chemguide.co.uk/inorganic...s/acidity.html

[Next Level]

(Original post by EierVonSatan)
Ah, well that's why you're struggeling

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

[EierVonSatan]

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

Nothing to do with me

[Next Level]

(Original post by EierVonSatan)
Nothing to do with me

Haha well you certainly are as clever