Electrochemical equivalent

Short description: 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:

[math]\displaystyle{ Z = M/q }[/math]

where [math]\displaystyle{ M }[/math] is the mass of substance and [math]\displaystyle{ q }[/math] is the charge passed. Since [math]\displaystyle{ q=It }[/math], where [math]\displaystyle{ I }[/math] is the current applied and [math]\displaystyle{ t }[/math] is time, we also have

[math]\displaystyle{ Z=M/It }[/math]

## 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

1. ↑ "Definition of ELECTROCHEMICAL EQUIVALENT" (in en). https://www.merriam-webster.com/dictionary/electrochemical+equivalent.

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