What is the cell voltage of the following reaction and is the reaction spontaneous? Ba + Pb2+ --> Ba2+ + Pb?

2020-05-15 4:15 pm

回答 (1)

2020-05-15 8:28 pm
Refer to: http://www2.ucdsb.on.ca/tiss/stretton/database/Standard_Reduction_Potentials.htm
Ba²⁺(aq) + 2e⁻ → Ba(s)        E° = -2.90 V
Pb²⁺(aq) + 2e⁻ → Pb(s)        E° = -0.13 V

Ba(s) + Pb²⁺(aq) → Ba²⁺(aq) + Pb(s)   E°cell
E°cell = E°(red) - E°(oxid) = [(-0.13) - (2.90)] V = 2.77 V

As E°cell = 2.77 V > 0, the reaction is spontaneous.


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