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Question

A galvanic (voltaic) cell consists of an electrode composed of chromium in a 1.0M

 chromium(III) ion solution and another electrode composed of copper in a 1.0M

 copper(II) ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 degrees C

Ecell=?V

 

Answer 1

Standard reduction potentials:

Cr³⁺ + 3e- ==> Cr Eº = -0.41 V (anode)

Cu²⁺ + 2e- ==> Cu Eº = = +0.34 V (cathode)

Eº_cell = 0.34 + 0.41 = 0.75 V