A galvanic (voltaic) cell consists of an inert platinum electrode in a solution containing 1.0 M tin(IV) ion and 1.0 M tin(II) ion,

Question

and another inert platinum electrode in a solution containing 1.0 M cobalt(III) ion and 1.0 M cobalt(II) ion, connected by a salt bridge. Calculate the standard potential for this cell at 25°C. Standard reduction potentials can be found in the standard reduction potentials table.

Answer 1

Standard reduction potentials:

Sn⁴⁺ + 2e- ==> Sn²⁺ Eº = 0.15 V (anode)

Co³⁺ + 2e- ==> Co²⁺ Eº = 1.82 V (cathode)

Eº_cell = 1.82 V - 0.15 V = 1.67 V