Chem Questions

This is from Edexcel 2002 exam paper. Says "NaClO3 can be obtained from NaOCl (aq) by a dispropornation reaction on heating. Give the ionic equation for this dispropornation reaction", for 2 marks.

Don't think we learnt how to do this, because I'm really stuck here. The second part of the question says "By a consideration of the oxidation numbers of the chlorine in the varios species, show why the reaction (i) is dispropornation". That's straightforward, but can't be done if I can't do the first. Anyone who know how to do this, please help.

Reply 1

hornblower

6

Mikan18

This is from Edexcel 2002 exam paper. Says "NaClO3 can be obtained from NaOCl (aq) by a dispropornation reaction on heating. Give the ionic equation for this dispropornation reaction", for 2 marks.

Don't think we learnt how to do this, because I'm really stuck here. The second part of the question says "By a consideration of the oxidation numbers of the chlorine in the varios species, show why the reaction (i) is dispropornation". That's straightforward, but can't be done if I can't do the first. Anyone who know how to do this, please help.

OCl- --> ClO3- + Cl-

Charge on chlorine in OCl- is +1
Charge on chlorine in ClO3- is +5
Charge on chlorine in Cl- is -1

Disproportionation is the simultaneous oxidation and reduction of a single species.

Reply 2

Greendaygirl

1

Mikan18

This is from Edexcel 2002 exam paper. Says "NaClO3 can be obtained from NaOCl (aq) by a dispropornation reaction on heating. Give the ionic equation for this dispropornation reaction", for 2 marks.

Don't think we learnt how to do this, because I'm really stuck here. The second part of the question says "By a consideration of the oxidation numbers of the chlorine in the varios species, show why the reaction (i) is dispropornation". That's straightforward, but can't be done if I can't do the first. Anyone who know how to do this, please help.

Yep his right.

Reply 3

Mikan18

OP

Thanks hornblower.

I added one more step, to balance the charges. Hope this is alright:

3OCl- -> ClO3- + 2Cl-

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