Why anode has to be replaced in electrolytic reduction of alumina?
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According to this source, graphite is used as anode material because carbon is easier to oxidize than O2−OX2−. The anodic oxidation of carbon
C+2O2− →CO2+4e−C+2OX2− →COX2+4eX−
proceeds more efficiently than the oxidation of O2−OX2− at an inert anode
2O2− →O2+4e−2OX2− →OX2+4eX−
CC is a much better reducing agent than O2−OX2− whose oxidation state is not changed in the reaction with graphite. As a consequence, anodic current density and the deposition rate of aluminium at the cathode will increase.
hope helps ☺️☺️☺️
C+2O2− →CO2+4e−C+2OX2− →COX2+4eX−
proceeds more efficiently than the oxidation of O2−OX2− at an inert anode
2O2− →O2+4e−2OX2− →OX2+4eX−
CC is a much better reducing agent than O2−OX2− whose oxidation state is not changed in the reaction with graphite. As a consequence, anodic current density and the deposition rate of aluminium at the cathode will increase.
hope helps ☺️☺️☺️
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