Mass of an element transported by 1 coulomb of electric charge
In chemistry, the electrochemical equivalent (Eq or Z) of a chemical element is the mass of that element (in grams) transported by a specific quantity of electricity, usually expressed in grams per coulomb of electric charge.[1] The electrochemical equivalent of an element is measured with a voltameter.
Definition
The electrochemical equivalent of a substance is the mass of the substance deposited to one of the electrodes when a current of 1 ampere is passed for 1 second, i.e. a quantity of electricity of one coulomb is passed.
The formula for finding electrochemical equivalent is as follows:
where is the mass of substance and is the charge passed. Since , where is the current applied and is time, we also have
Eq values of some elements in kg/C
Element
|
Electrochemical equivalent
|
Silver (Ag)
|
1.118×10^(-6)
0.000118gm/c
|
Copper (Cu)
|
3.295×10^(-7)
|
Gold (Au)
|
6.812×10^(-7)
|
Iron (Fe)
|
2.894×10^(-7)
|
Zinc (Zn)
|
3.389×10^(-7)
|
Hydrogen (H2)
|
1.044×10^(-7)
|
Sodium (Na)
|
2.387×10^(-7)
|
Potassium (K)
|
4.055×10^(-7)
|
Oxygen (O2)
|
8.28×10^(-8)
|
Aluminum (Al)
|
9.36×10^(-8)
|
References