Note:Electrolysis of molten compound

Electrolysis of molten compound

1.All feely moving ions in molten : ______________________ , ______________________

2.When complete circuit , ________ ion move to the cathode and ____________ ion move to

the anode.

3.At the cathode, lead (II) ion accept 2 electron to form lead atom.

Half equation :___________________________________________________________

4. At the anode , bromide ion release 1 electron to form bromine atom. Two bromine atom

combine to form bromine gas.

Half equation :_______________________________________________________________

5.Overall equation : _____________________________________________________________

6.

Electrode	Observation	Product
Anode	____________ gas.	Bromine gas
Cathode	_____________ solid deposited	Lead atom

7. Please complete the following table.

Electrolyte (molten)	Substance formed at		Half equation at
	Anode	Cathode	Anode	Cathode
Aluminium oxide		Aluminium
Potassium iodide				+àK
Sodium chloride	Chlorine gas
Zinc bromide			à+

Electrolysis of aqueous solution

Water is the solvent for the ionic compound.

Therefore , aqueous solution salt have two set of ions :

Ions from salt solution

Ions from water

Which ion is chosen to be discharged ?

Factors that affect the electrolysis of aqueous solution

(i) Position of ions in the Electrochemical Series.