Homework Help: AP Chem

Posted by rose on Monday, October 10, 2011 at 9:22pm.

I'm having trouble balancing these two oxidation-reduction reactions that occur in a basic solution. Can anyone help? Please? The numbers after the formulas are subscripts and any with a minus sign means they are negatively charged (-1). Thanks!!

Al(s)+ MnO4-(aq)---> MnO2(s)+Al(OH)4-(aq)

NO2-(aq)+Al(s)-->NH3(g)+AlO2- (aq)

AP Chem - DrBob222, Tuesday, October 11, 2011 at 1:27am
Here are the two half equations (unbalanced) for the first one.
Al + 4OH^- ==> Al(OH)4^- + 3e
MnO4^- + 2H2O + 3e ==> MnO2 + 4OH^-

Add the two equations to obtain the balanced equation.

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