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November 01, 2025, 12:30:44 pm
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Author Topic: Oxidation numbers!  (Read 523 times)  Share 

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Zebra

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Oxidation numbers!
« on: April 17, 2011, 09:58:43 pm »
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Sometimes you get given an equation like this.

H- + H20 --> OH- + H2

and here I figured that its acid and base reaction but
when i was verifying whether this was a redox eq, I struggled
because there was more than one H on both sides.

When I checked the answers, it told me its also  a redox eq because
the oxidation number of hydrogen

in H- = -1 increases to H2= 0

and hydrogen in H20= 1 decreased to H2=0.

So the key here is to write down all the oxidation numbers of a particular element, in this case
it's hydrogen and see the change?
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2010:
Mathematical Methods CAS 3/4 [41->45.8]

2011:
English Second Language 3/4 [46->47.1], Chemistry 3/4 [42->45.6], Specialist Maths 3/4 [38->49.2], LOTE [33->40.9], Biology 3/4 [41->42]

aggregate: 195.9
2011 ATAR: 99.25

2012-2015: Bachelor of Pharmacy (Honours)
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