Question
Sat April 05, 2014 By: Tushar Jandial

 

Expert Reply
Mon April 21, 2014
Dear Tushar

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.

In case of multiple questions within a query, please post each question individually and let us know where you are getting stuck so that we would be able to explain things better.
 
However, answer to your first query is,

The potential of Mn2+/Mn3+ is approximately 1.5V, which is higher than the potential of Co2+/Co3+ approximately 1.82V). In this case, however, this potential exists on the lower side with respect to the actual potential (approximately 2V) at the time of occurrence of a side reaction on the positive electrode side such as generation of oxygen gas resulting from water decomposition or electrode oxidation as described above.

Co2+/Co3+: approximately 1.82V. Thus, this potential is higher than the potential of Mn2+/Mn3+.

When a divalent manganese ion (Mn2+) is contained, an oxidation reaction of Mn2+ is to first occur before occurrence of the side reaction on the positive electrode side such as generation of oxygen gas described.

 
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Topperlearning Team.
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