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Year 11 Chem

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Collin Li:
bec, something like that is pretty ambiguous. You wouldn't be expected to know the products of the reaction between iron (III) oxide and carbon monoxide (not for VCE).

bec:
ok thanks for that coblin, good to know!

i've got another question...it's kind of nitpicky but some of you smarties out there can probably help:

"write a full equation for the reaction of ammonium hydroxide and aluminium nitrate"
i just assumed (correctly as it turns out) that it would be:
3NH4OH + Al(NO3)3 --> 3NH4NO3 + Al(OH)3
but since NH4+ and OH- aren't on the electrochemical series sheet we're given, how do we know that a reaction will take place at all? is there another way to predict the "feasibility" of a reaction?

Collin Li:

--- Quote from: bec on December 30, 2007, 12:01:45 am ---but since NH4+ and OH- aren't on the electrochemical series sheet we're given, how do we know that a reaction will take place at all? is there another way to predict the "feasibility" of a reaction?

--- End quote ---

Oh. You have a flaw in your thinking here. The electrochemical series tells you if reduction or oxidation will occur (see how all the half equations involve the transfer of electrons?). In this reaction, no such thing is happening. It is not a redox reaction, it is just a rearrangement of the ions.

You won't really need to know if a reaction proceeds. You'll learn more about the kinetics of the reaction in Unit 4, I think.

bec:
oh yeah, redox! it's coming back to me now...
thank you!
so basically, the only use (for a pre- unit 3/4 chem student anyway) of the electrochemical series is to determine if a redox reaction will occur and if so, which will be the oxidant etc?

Collin Li:
Yeah, pretty much :)

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