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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: Nomvalt on March 21, 2010, 12:13:55 pm

Title: Redox reactions - identifying conjugates (easy)
Post by: Nomvalt on March 21, 2010, 12:13:55 pm
Is the following a redox reaction? If it is a redox reaction, identify the oxidant, the reductant and their conjugates by annotating the equation.

Fe(s) + CuSO4(aq) ---> FeSO4(aq) + Cu(s)

I get confused with questions that ask for the conjugate oxidant of a reductant (or conjugate reductant of an oxidant). :(
Title: Re: Redox reactions - identifying conjugates (easy)
Post by: Edmund on March 21, 2010, 12:35:08 pm
Cu2+ gets reduced and is therefore an oxidant. Cu is the conjugate reductant.

Fe gets oxidised and is therefore a reductant. FeSO4 is the conjugate oxidant.
Title: Re: Redox reactions - identifying conjugates (easy)
Post by: coletrain on March 21, 2010, 12:39:05 pm
i find writing the ionic equation help to identify either oxidant and or reductant
Title: Re: Redox reactions - identifying conjugates (easy)
Post by: Nomvalt on March 21, 2010, 12:40:47 pm
Quote from: Edmund on March 21, 2010, 12:35:08 pm
Cu2+ gets reduced and is therefore an oxidant. Cu is the conjugate reductant.

Fe gets oxidised and is therefore a reductant. FeSO4 is the conjugate oxidant.

Would it still be correct if you had said that the oxidant was Cu2+ in CuSO4 or CuSO4?

And what about if you had said that the conjugate oxidant was Fe2+ in FeSO4? Or does it not really matter?
Title: Re: Redox reactions - identifying conjugates (easy)
Post by: Edmund on March 21, 2010, 12:44:53 pm
Quote from: Nomvalt on March 21, 2010, 12:40:47 pm
Quote from: Edmund on March 21, 2010, 12:35:08 pm
Cu2+ gets reduced and is therefore an oxidant. Cu is the conjugate reductant.

Fe gets oxidised and is therefore a reductant. FeSO4 is the conjugate oxidant.

Would it still be correct if you had said that the oxidant was Cu2+ in CuSO4 or CuSO4?

And what about if you had said that the conjugate oxidant was Fe2+ in FeSO4? Or does it not really matter?
I think it would be correct and wouldn't matter

Not sure about this though
Title: Re: Redox reactions - identifying conjugates (easy)
Post by: Nomvalt on March 21, 2010, 12:55:13 pm
2Na(s) + 2H2O(l) ---> 2NaOH(aq) + H2(g)

With the same question as above but using a different equation would:
oxidant = H in H2O
reductant = Na
Conjugate reductant of oxidant= H2
Conjugate oxidant of reductant: NaOH

?
Title: Re: Redox reactions - identifying conjugates (easy)
Post by: Edmund on March 21, 2010, 02:07:15 pm
Quote from: Nomvalt on March 21, 2010, 12:55:13 pm
2Na(s) + 2H2O(l) ---> 2NaOH(aq) + H2(g)

With the same question as above but using a different equation would:
oxidant = H in H2O
reductant = Na
Conjugate reductant of oxidant= H2
Conjugate oxidant of reductant: NaOH

?
Yes