Electrolysis (Types of electrodes)

III) Types of electrodes used Electrolysis of 0.2 mol dm-3 copper(II) sulphate solution Using copper electrodes Ions present:
Electrode	Anode (+)	Cathode (-)
Ions attracted
Ion discharged
Half Equation
Observation
Product formed	-
Colour of the electrolyte

Electrolysis of 1.0 mol dm-3 sodium chloride solution

II) The concentration of ions in the solution Electrolysis of 1.0 mol dm-3 sodium chloride solution Ions present:
Electrode	Anode (+)	Cathode (-)
Ions moving
Ion discharged
Reason
Half Equation
Observation
Product formed

Electrolysis of Aqueous solutions

1. Example, sodium chloride solution consists of 4 type of ions

Ions	Cation	Anion
Sodium chloride	Na+	Cl-
Water	H+	OH-

2. Three factors that affect the selective discharge of ions at the

    electrodes during electrolysis of an aqueous solution:

I    The position of ions in the electrochemical series.

II   The concentration of ions in the solution

III Types of electrodes used  

Observation	inference
Colourless gas released	H2 / O2
Greenish yellow gas (Blue litmus → red → white)	Cl2
Brown gas	Br2
Grey solid deposited	Pb/Al
Brown solid deposited	Cu

Electrolysis (molten)

Electrolysis of molten lead(II) bromide Ion present:
Electrode	Anode (+)	Cathode (-)
Ions moving
Half Equation
Observation
Product formed

Answer: