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A negative Ecell° indicate that a redox reaction is non-spontaneous.
A negative Ecell° indicate that a reverse reaction will not proceed in the forward direction but will proceed spontaneously in the opposite direction.
A positive E°cell means that the reaction will occur spontaneously as written. A negative E°cell means that the reaction will proceed spontaneously in the opposite direction.
A redox reaction is spontaneous if the standard electrode potential for the redox reaction, Eo(redox reaction), is positive.
Eo(redox reaction) = Eo(reduction reaction) + Eo(oxidation reaction)
and Eo(redox reaction) > 0
that is, Eo(redox reaction) is positive
If Eo(redox reaction) is positive, the reaction will proceed in the forward direction (spontaneous).
Spontaneous redox reactions can be used to produce electricity
If Eo(redox reaction) is negative (Eo(redox reaction) < 0), the reaction will not proceed in the forward direction (non-spontaneous).
If the negative Ecell° exists , it represents that only the opposite reaction is spontaneous. It directs to the cathode's oxidation and the anode's reduction. The change in Gibbs free energy in a galvanic cell, where a spontaneous redox reaction causes the cell to produce an electric potential, must be negative.
A positive value denotes the oxidation-reduction reaction that exists as a spontaneous reaction. That indicates without the help of an external agency. Here decrease at the cathode and oxidation at the anode takes place. If it exists a negative value, it means only the reverse reaction is spontaneous. It indicates oxidation at the cathode and reduction at the anode.
To learn more about the Ecell° please click on the link https://brainly.com/question/7582637
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