Zn is a metal which forms cations
But why Zn container acts as an anode in a dry cell
Asked by lovemaan5500 | 7th Jan, 2018, 03:51: PM
In the dry cell, the Zn container acts as an anode and graphite is act as a cathode surrounded by MnO2 + Carbon.
here is a paste of NH4Cl and ZnCl2 is filled in between the electrodes.
Zn(s) → Zn2+ + 2e-
2MnO2(s) + NH4+(aq) + 2e- →Mn2O3(s) + 2NH3(g) + H2O
Zn2+ combines with NH3 to form diammonium Zn(II) cation.
The dry cell has a short life, as NH4Cl corrodes Zn container even when the cell is not in use.
Answered by Ramandeep | 7th Jan, 2018, 09:20: PM
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