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Topic: 2 catalyst examples, why are they wrong?  (Read 3751 times)

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Offline lazipeter

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2 catalyst examples, why are they wrong?
« on: April 17, 2010, 10:57:08 AM »
1. Fe2+ or Fe3+ act as homogeneous catalyst in the reaction:
I2(aq) + 2 S2O3(aq) :rarrow: 2 I-(aq) + S4O6(aq)

2. Mn2+ acts as an autocatalyst in the reaction:
10 I-(aq) + 2 MnO4-(aq) +16 H+(aq) :rarrow: 5 I2(aq) + 2 Mn2+(aq) + 8 H2O(l)

they are wrong, why??

thanks!!

Offline sjb

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Re: 2 catalyst examples, why are they wrong?
« Reply #1 on: April 17, 2010, 11:21:43 AM »
What is the definition of a catalyst?

Offline lazipeter

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Re: 2 catalyst examples, why are they wrong?
« Reply #2 on: April 17, 2010, 01:06:17 PM »
Sth can provide an alternative reaction route with smaller activation energy so that the reaction rate becomes faster.
Fe3+ or Fe2+ can react with the reducing agent and oxidizing agent subsequently by means of changing its oxidation states, and Mn2+ can also have variable OS so why they're wrong??
Moreover Fe2+, Fe3+ are postively charged so I think they should attract the reactants so Fe2+,Fe3+ should be able to be the catalyst.
 ??? ???

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