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Topic: ammonium iron(II) sulfate and Dichromate.  (Read 5549 times)

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Offline Robertsays

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ammonium iron(II) sulfate and Dichromate.
« on: April 04, 2008, 09:45:55 AM »
Cr2O72-  + (NH4)2SO4.Fe2SO4.6H2O -->

Can anyone help me out here?

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Offline Borek

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Re: ammonium iron(II) sulfate and Dichromate.
« Reply #1 on: April 04, 2008, 09:53:21 AM »
Please read forum rules.

Mohr's salt is dissociated in this reaction. Split it into ions, than think what is reacting with what - you have an oxidizer and a reducing agent.
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Offline Robertsays

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Re: ammonium iron(II) sulfate and Dichromate.
« Reply #2 on: April 04, 2008, 11:35:18 AM »
sorry,

Cr2O72- + 14H+ + 6e- ---> 2Cr3+ + 7H2O     (reduction)

Fe2+ ---> Fe3+ + e-      (oxidation)

so,

Cr2O72- + 6Fe2+ +  14H+ --> 2Cr3+ + 6Fe3+ +  7H2O

but do the ammonium and sulfate ions react with anything? seems too simple.

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Offline Borek

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Re: ammonium iron(II) sulfate and Dichromate.
« Reply #3 on: April 04, 2008, 01:36:44 PM »
They are just spectators. And your equation is correct :)
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