Homework Help: chemistry Help

Posted by sailor on Tuesday, January 10, 2012 at 7:43pm.

Consider the following two reactions:

5 Fe2+(aq)+MnO41-(aq)+8 H1+(aq)-->5Fe3(aq)+Mn2+(aq)+4 H2O(l)

2 MnO41-(aq)+5 C2O42-(aq)+16 H1+(aq)-> 2 Mn2+(aq)+CO2 g)+8 H2O(l)

Both of these reactions result in the purple permanganate (MnO41-(aq)) ion reacting to form the colourless manganese (II) ion. The difference is that the first reaction happens in a few seconds, while the second occurs over several minutes. Explain why this so, based on what you know of chemical reactions and what you can see in these two reaction equations.

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