Standard reduction potentials for various half-reactions under acidic and basic conditions are given in the linked tables on the facing page. Remember that these potentials really are for cells in which the electrons required on the left side of the given half-reaction are provided by oxidizing H₂ to H⁺ ions, but that whenever we use two of these half-reactions to calculate the potential of a real cell, the hydrogen contributions cancel. Also remember that a potential is a "pressure" on a per electron basis, no matter how many electrons appear in the half-reaction. The free energy for that half-reaction coupled in a cell with the hydrogen half-reaction can be found by multiplying the reduction potential by -23.06 kcal times the number of electrons involved in the half-reaction.

Example. What are the cell voltage and free energy change in a cell with the reaction

Which way will the reaction go spontaneously?

Solution

Now find out how to Build cells from Half Rections