A galvanic
cell is generally represented by putting a vertical line between metal
and electrolyte solution and putting a double vertical line between
the two electrolytes connected by a salt bridge Under this convention
the emf of the cell is positive and is given by the potential of the half-
cell on the right hand side minus the potential of the half-cell on the
left hand side i e ,
Ecell = Eright  – Eleft
This is illustrated by the following example:
Cell reaction:
Cu(s) + 2Ag+(aq) ¾® Cu2+(aq) + 2 Ag(s)
(2