The mass of any substance liberated at the electrode in electrolysis is proportional to the mass of a given substance liberated when unit a quantity of charge passes through the electrolyte

Formula 1

G = g.I.t

Where:

G is the mass of deposited substance in milligrams (mg)

g is the chemical equivalent of the involved substance in mg/As

I is the amount of current flowing between electrodes in amperes (A)

T is the electrolysis time in seconds (s)

Electrochemical Equivalents of Some Substances

 Íon G (mg/As) H+ 1,0104 O- 0,0829 Al+++ 0,936 OH- 0,172 Fe+++ 0,1930 Ca++ 0,2077 Na+ 0,2388 Fe++ 0,2895 C03-- 0,3108 Cu++ 0,3297 Zn++ 0,3387 Cl- 0,3672 SO4- - 0,4975 Cu+ 0,6590 Ag+ 1,118

Derivated Formulas:

Formula 2

I = G / (g . t)

Formula 3

t = G / (g . I)

Application Example:

Calculate the mass of silver (Ag) deposited in na electrolysis process when a 2 A current flows for 10 minutes.

Data:

G = 1,118 mg/As

I = 2 A

T = 10 minutes = 600 seconds

Applying formula 1:

G = 1,118 x 2 x 600 = 1 341 mg ou 1,341 g

N° of component