help with balancing using oxidation numbers

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PigeonParliament
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#1
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Cl2 + NaOH (imagine this is an arrow) NaClO3 +NaCl +H2O

Could someone explain how to balance this using oxidation numbers.
I'm not quite sure how to balance this using oxidation numbers because the chlorine messes stuff up a bit.
Any help really appreciated- don't really have a chemistry teacher since this coronavirus thing, but I guess no one does anymore.
Thanks!
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gongoozled goose
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First off we gotta remember what kind of reaction is it...
1. Chlorine with cold alkali
2. Chlorine with hot alkali

In the first case, we need to know that chlorine is oxidised to +1 in the compound NaClO
In the second case, chlorine is oxidised to +5 in the compound NaClO3

Then we balance off equation as usual
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PigeonParliament
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(Original post by lyer_in_hellfyre)
First off we gotta remember what kind of reaction is it...
1. Chlorine with cold alkali
2. Chlorine with hot alkali

In the first case, we need to know that chlorine is oxidised to +1 in the compound NaClO
In the second case, chlorine is oxidised to +5 in the compound NaClO3

Then we balance off equation as usual
The question doesn't mention the conditions of the reaction- it just says use oxidation states to balance the following.
I worked out that the oxidation state of Cl in NaClO3 was 5+ but then I didn't know what to do after that. I wasn't quite sure what to do because Cl in NaCl as well and in this compound it has an oxidation state of -1, so I didn't know how to balance that part. Sorry- I'm completely clueless on this topic- this is the first question I've ever done on it!
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Deggs_14
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#4
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3Cl2 + 6NaOH ---> NaClO3 + 5NaCl + 3H2O
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gongoozled goose
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(Original post by PigeonParliament)
The question doesn't mention the conditions of the reaction- it just says use oxidation states to balance the following.
I worked out that the oxidation state of Cl in NaClO3 was 5+ but then I didn't know what to do after that. I wasn't quite sure what to do because Cl in NaCl as well and in this compound it has an oxidation state of -1, so I didn't know how to balance that part. Sorry- I'm completely clueless on this topic- this is the first question I've ever done on it!
Ahh i see..
Ok you've identified the elements whose oxidation no. changed i suppose?
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PigeonParliament
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(Original post by lyer_in_hellfyre)
Ahh i see..
Ok you've identified the elements whose oxidation no. changed i suppose?
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Ah, I get it! thanks so much for your help - you're really great at explaining stuff!
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gongoozled goose
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(Original post by PigeonParliament)
Ah, I get it! thanks so much for your help - you're really great at explaining stuff!
Adapted it frm textbook i got to revise aswell so thank u and Deggs_14 for confirming the balanced eqn
Last edited by gongoozled goose; 6 months ago
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