WAEC - Chemistry (2022 - No. 5)
What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3?
One Faraday
One ampere
Three Faradays
Three amperes
Erläuterung
AlCl3 → Al3+ + 3Cl-
At cathode:
Al3+ + 3e- → Al
3 mole of electrons corresponds 3 F charge
So, required charge =3 F
At cathode:
Al3+ + 3e- → Al
3 mole of electrons corresponds 3 F charge
So, required charge =3 F