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