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ligand q

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cara.mel:
Yay, now I can reply without stealing Nina's turn to post/helping streak etc

There is on the electrochemical series somewhere Sn4+ + 2e- -> Sn2+. That's what the question would have been using. But it's not on VCAA's one, so don't worry about it :)

Kopite:

--- Quote from: "ninwa" ---
--- Quote from: "Kopite" ---
yeah those are the ones...do i need to know anymore???

and one more question lol

will AgNO3 and SnCl2 react to an appreciable extent??? a NEAP exam says so.....

thanks lol
--- End quote ---


lol ... I guess just know acid + base, acid + water, base + water

I'm assuming AgNO3 and SnCl2 are aqueous? According to the electrochemical series:

Cl2 ---> 2Cl-
O2 + 4H+ + 4e- ---> 2H2O
Ag+ ---> Ag
Sn2+ ---> Sn

I don't see a spontaneous reaction there .... better ask coblin this one :P


As for the ligands thing - according to my textbook:

"Complex ions may be formed with ligands other than water. Polar molecules, such as ammonia, which contain an non-bonding pair of electrons, are particularly effective as ligands."
--- End quote ---


yeah thanks...i think we might've interpreted the question wrong, it asks for a reaction, but does not necessarily state it had to be with those elemental ions. so yeah it should be right. water will react instead of chlorine, so there will be a reaction lol

thanks for that ligand info

Collin Li:
Well, I'm not sure what VCE does, because they do their ligands completely wrong! The formula should be:

[Cu(NH3)4(H2O)2]SO4

The SO4 2- ion is just a "counterion" to balance the charge of the overall complex in the square brackets. Copper is in an octahedral 6 coordinate complex, with the ligands NH3 and H2O.

NH3 and H2O are the only ones you show the dotted lines linking to, because they are the actual ligands. The SO4 2- "counterion" only balances out the +2 charge that the copper centre possesses, but it is only an electrostatic attraction (as opposed to a ligand interaction, i.e.: the dotted lines you use in VCE).

Kopite:

--- Quote from: "coblin" ---Well, I'm not sure what VCE does, because they do their ligands completely wrong! The formula should be:

[Cu(NH3)4(H2O)2]SO4

The SO4 2- ion is just a "counterion" to balance the charge of the overall complex in the square brackets. Copper is in an octahedral 6 coordinate complex, with the ligands NH3 and H2O.

NH3 and H2O are the only ones you show the dotted lines linking to, because they are the actual ligands. The SO4 2- "counterion" only balances out the +2 charge that the copper centre possesses, but it is only an electrostatic attraction (as opposed to a ligand interaction, i.e.: the dotted lines you use in VCE).
--- End quote ---


ic. umm...i probably just wrote it out wrong, i was in a bit of a rush, sorry. we don't really have to know about the counterion right???

thanks for the help.

Kopite:
oh and coblin, do you have any advice on the writing of equations??? there seems to be at least 2 options for every reaction!!!! are the general equations we learnt in unit 3 sufficient for unit 4???

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