A2.2 Electrolysis Calculations
These always involve using the equation
Note: I is the current in amps, t is the time in seconds, Q is the number of coulombs of electrical charge that have passed through the electrolytic cell. This charge can be related to the charge on one mole of electrons.
1 mole of electrons has a charge of 96,500 coulombs = 1 Faraday
You will need to take into account how many F of charge is needed to deposit 1 mole of the substance in question. So you will need the following electrode equation:
so 1 mole of Ca needs 2 F but 1 mole of Al needs 3F
Hint: keep all the numbers in the calculator and only round off to three significant figures (3 s.f.) at step 5.