Question

How do I write the equations for the Alkaline Zinc/Manganese Dioxide cell?

Answer 1

Answer :

An alkaline battery is a type of primary battery which derives its energy from the reaction between zinc metal and manganese dioxide.

The oxidation-reduction half reactions are :

Oxidation : $Zn(s)+2OH^-(aq)\rightarrow ZnO(s)+H_2O+2e^-$

Reduction : $2MnO_2(s)+H_2O+2e^-\rightarrow Mn_2O_3(s)+2OH^(aq)$

The overall reaction will be :

$Zn(s)+2MnO_2(s)\rightarrow ZnO(s)+Mn_2O_3(s)$