A balanced redox reaction equation from each cell notation is given as
2Mn²⁺ + 2H₂O + 2Co³⁺ ---- 2MnO₂ + 2Co²⁺ + 4H⁺
The above reaction is spontaneous.
The reaction in which both reduction and oxidation reaction take place at the same time is termed as redox reaction.
Oxidation reactions are those kind of reaction in which a substance or compound or species looses its electron. In this type of reaction, oxidation state of an element goes on increasing.
Reduction reaction are those kind of reaction in which a substance or compound or species accept thr electron. In this type of reaction, oxidation state of an element goes on decreasing.
At Cathode:
E°(Mn) = -1. 19V × 2 = -2. 38V
At anode:
E°(Co³⁺) = 1. 8 × 2 = 3.6 V
E°cell = 3.6 + 2.38
= 5.98V
Since, the gibbs free energy of the following reaction is negative. Therefore reaction is spontaneous.
Thus, we concluded that the balanced redox reaction equation from each cell notation is given as
2Mn²⁺ + 2H₂O + 2Co³⁺ ---- 2MnO₂ + 2Co²⁺ + 4H⁺
The above reaction is spontaneous.
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