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Double-line bridge method for redox reaction of ferric chloride and iron
According to the chemical equation Fe+2FeCl3=3FeCl2.

The valence of Fe increased from 0 to +2 in FeCl2 _ 2, with a total increase of two and a loss of two electrons.

The valence of Fe in 2FeCl3 decreased from +3 to +2 in FeCl2, and the valence of 1 Fe3+ decreased by 1, thus two electrons were obtained.

Double-track bridge: writing loss of Fe-FeCl 2 bridge 1*2e-

Fecl3-Fecl2 bridge can write 2*e-

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