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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.
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
Alternative formula for finding electrochemical equivalent is as follows:
where is the Equivalent weight of the substance and is Faraday constant
| 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) |
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