Question

A common reference electrode consists of a silver wire coated with AgCl(s) and immersed in 1 M KCl (pictured in Question 7).

AgCl (s) + e^- → Ag(s) + Cl^- (1 M)      E° = 0.2223 V

What is E_cell when this electrode is a cathode in combination with a standard zinc electrode as an anode?

Answer 1

the Ecell of the system under investigation can be found out 

Ecell = Eindicator −Ereference

so if we compare this equation to standard equation

Ecell = Ecathode −Eanode 

and rearrange the to

Eindicator = Ecell + Ereference Ecathode = Ecell + Eanode