The electrochemical equivalent (denoted as \( E \)) is the amount of substance deposited or dissolved at an electrode during electrolysis for the passage of 1 coulomb of charge. The formula for the electrochemical equivalent is:
\[
E = \frac{M}{nF}
\]
Where:
- \( E \) = electrochemical equivalent (in grams per coulomb)
- \( M \) = molar mass of the substance (in grams per mole)
- \( n \) = number of electrons involved in the reaction (valency of the substance)
- \( F \) = Faraday's constant (approximately 96,485 C/mol)
This formula tells you how much of a substance (in grams) will be deposited or dissolved when 1 coulomb of charge passes through the electrolyte during electrolysis.