explain the electrochemical phenomenon involved in rusting of iron.
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The electrons released at the anodic spot move through the metal and reduce oxygen at another spot in the presence H+ ion. This spot behaves as cathode.
The reaction taking place at cathode is given by
Sources of H+ ions may be
H2CO3, formed due to the dissolution of CO2from air into water
Water, formed due to the dissolution of other acidic oxides from atmosphere
The overall reaction is
The Fe2+ ions thus formed are further oxidised by atmospheric oxygen to Fe3+ ions, and finally, it comes out as rust.
The reaction taking place at cathode is given by
Sources of H+ ions may be
H2CO3, formed due to the dissolution of CO2from air into water
Water, formed due to the dissolution of other acidic oxides from atmosphere
The overall reaction is
The Fe2+ ions thus formed are further oxidised by atmospheric oxygen to Fe3+ ions, and finally, it comes out as rust.
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When the electro chemical phenomenon invived in rusting of iron
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