Electrochemical equivalent
The Electrochemical equivalent, sometimes abbreviated Eq or Z, of a chemical element is the mass of that element (in grams) transported by 1 coulomb of electric charge. The electrochemical equivalent of an element is measured with a voltameter.
Definition
The electrochemical equivalent of a substance may be defined as 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, 'M' is the mass of substance and
'q' is the charge passed.
Also q=It
Hence, Z=M/it
where 'I' is the current applied and
't' is the time.
Eq values of some elements
| Element | Electrochemical Equivalent |
|---|---|
| Silver (Ag) | 1.118×10^(-6) |
| Copper (Cu) | 3.295×10^(-7) |
| Gold (Au) | 6.812×10^(-7) |
| Iron (Fe) | 2.894×10^(-7) |
| Zinc (Zn) | 1.58×10^(-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^(-7) |
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