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Alternative Catalyst

I'm doing my chemistry A2 salters b individual investigation. The topic I've chosen is the Harcourt-essen reaction.

The lab cannot get hold of any ammonium molybdate (VI) catalyse the reaction between Hydrogen peroxide and Potassium Iodide. Does anyone know a suitable alternative?
Original post by PaisleyD
I'm doing my chemistry A2 salters b individual investigation. The topic I've chosen is the Harcourt-essen reaction.

The lab cannot get hold of any ammonium molybdate (VI) catalyse the reaction between Hydrogen peroxide and Potassium Iodide. Does anyone know a suitable alternative?


Do you just mean the decomposition reaction of peroxide to O2 and water? If so MnO2 does the trick.... It actually does the trick very violently. I sorta formed a geyser by adding a bit too much powdered MnO2 to hydrogen peroxide in a RBF.
Reply 2
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PaisleyD
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Original post by JMaydom
Do you just mean the decomposition reaction of peroxide to O2 and water? If so MnO2 does the trick.... It actually does the trick very violently. I sorta formed a geyser by adding a bit too much powdered MnO2 to hydrogen peroxide in a RBF.


This is the reaction


H2O2(aq)+ 2I-(aq) + 2H+(aq)→ I2(aq) + 2H2O(aq)


I think the MnO2 should work

The Iodide ions come from potassium iodide
(edited 10 years ago)
Original post by PaisleyD
This is the reaction


H2O2(aq)+ 2I-(aq) + 2H+(aq)→ I2(aq) + 2H2O(aq)


I think the MnO2 should work

The Iodide ions come from potassium iodide


Wow I din't realise the I- came from the KI!!!! :P

TBH I don't actually know the reaction mechanisms for either reaction (and no i don't mean just the equation I mean proper stuff....) so I couldn't answer as to if it would work for this reaction. I have only come across MnO2 in my proper studies once and it did some fancy radical reaction that I can;t really remember about.
Reply 4
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PaisleyD
OP
Original post by JMaydom
Wow I din't realise the I- came from the KI!!!! :P

TBH I don't actually know the reaction mechanisms for either reaction (and no i don't mean just the equation I mean proper stuff....) so I couldn't answer as to if it would work for this reaction. I have only come across MnO2 in my proper studies once and it did some fancy radical reaction that I can;t really remember about.


Ok thank, I'll check it with my teacher next week.
Original post by PaisleyD
Ok thank, I'll check it with my teacher next week.


I doubt they'll know...... Least not off the top of their head

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