00:01
So it's critical in an electrolysis problem to find the number of moles of electrons that are being transferred in the reaction.
00:10
So we can do that by looking at the change in oxidation state from aluminum in its oxide to its solid form.
00:18
So we know that in the solid form it's going to be zero, the oxidation state of aluminum in aluminum oxide.
00:26
If we know that oxygen from our oxidation state rules is always minus 2, and we assign aluminum to be x.
00:36
That gives us the equation 2x minus 6 equals 0, 0 being the fact that this is a neutral species.
00:45
That means that x for the oxidation state of aluminum is plus 3, and therefore there are three electrons needed to reduce the aluminum to its pure form.
00:57
So now that information is going to be really helpful.
01:00
We can take the time, we're given time and current.
01:03
We can use our equation current equals charge over time to give us the charge.
01:09
We can use faraday's constant to determine how many moles of electrons are needed to produce that charge...
