Batteries

Exercise 1

      

Given a Leclanché battery in an acid medium: MnO2 /MnO(OH) and Zn2+/ Zn Write the equations of the reactions at the electrodes!

A natural reaction takes place between the strongest reducing agent Zn and the strongest oxidising agent MnO2: MnO2+ H+ + e- MnO(OH) Zn Zn2+ + 2 e-

Which is the negative battery terminal?

The zinc metal is the strongest reductant, so the negative terminal is the zinc electrode.