what does spontaneity of redox reaction mean?
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A positive voltage that forms across the electrodes of a voltaic cell indicates that the oxidation-reduction reaction is a spontaneous reaction for reduction at the cathode and oxidation at the anode.
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A redox reaction is spontaneous if the standard electrode potential for the redox reaction, Eo(redox reaction), is positive. ... Note: The reaction will be spontaneous in the reverse direction! And non-spontaneous redox reactions cannot be used to produce electricityOxidation-reduction or redox reactions are reactions that involve the transfer of electrons between chemical species (check out this article on redox reactions if you want a refresher!).
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