Posted by EJ on Tuesday, February 22, 2011 at 8:22pm.
In the equation Mn goes from +7 to +2 and As goes from +3 to +5. That should give you the information to balance. Here is a site that may help but please re-post if you have a more detailed question about the procedure.
http://www.chemteam.info/Redox/Redox.html
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