Electrolysis Calculator

Electrolysis Calculator

The Electrolysis Calculator applies Faraday's first law of electrolysis to relate the mass deposited or dissolved at an electrode to the electric charge passed through the cell.

$$m = Z \times Q$$

where $m$ is mass in kilograms, $Q$ is charge in coulombs, and $Z$ is the electrochemical equivalent in kg/C. Charge is also related to current and time:

$$Q = I \times t$$

The electrochemical constant is derived from molar mass $M$, valence $n$, and Faraday's constant $F$:

$$Z = \frac{M}{n \times F}$$

For example, depositing copper from $\text{Cu}^{2+}$ requires two electrons per atom ($n = 2$). With $M = 63.546$ g/mol and $F \approx 96485$ C/mol, copper's electrochemical equivalent is about $3.29 \times 10^{-7}$ kg/C.

Related electrochemistry tools: Electrodialysis Calculator and Combustion Reaction Calculator.