However,
coulometers are now obsolete and we now have constant current (I)
sources available and the quantity of electricity Q, passed is given by
Q = It
Q is in coloumbs when I is in ampere and t is in second The amount of electricity (or charge) required for oxidation or
reduction depends on the stoichiometry of the electrode reaction For
example, in the reaction:
Ag +(aq) + e– ® Ag(s)
(2 30)
One mole of the electron is required for the reduction of one mole
of silver ions