Grade 9 students carry electrolysis of water at Shajara Science Laboratory
Experiment: Electrolysis of water
Objective: To explain changes takes place during electrolysis of water
D.C. power supply, Electrolysis jar with two inert electrodes
Connecting wires and alligator clips, Distilled water
Electrolyte: sulfuric acid solution H2SO4 or potassium nitrate solution KNO3
Set up the apparatus
Pour distilled water in the electrolysis jar /let water cover electrodes
Add few milliliters of sulfuric acid or potassium nitrate solutions into the jar
Turn on the D.C. power supply
Collect the gases formed at each electrode test tubes
Put a flame close to the mouth of each test tube then open it
Release of gas (bubbles) is observed at each electrode
The volume of gas formed at (-) pole is double that formed at (+) pole of power supply
The gas collected at the (-) pole burns with explosion /pop sound
The gas collected at the (+) pole lights a glowing splint
What does the release of gas indicate?
What is the gas formed at each electrode?
What are the reactants and the products of this chemical reaction?
What is the type of this chemical reaction? Is this reaction spontaneous/non-spontaneous?
Write the balanced chemical equation of this reaction
What is the role of electrolyte added to distilled water?
Write the half reaction occurring at each electrode
Practice more: Worksheet
Electrolysis of water using ordinary apparatus
Electrolysis of water using Hoffman apparatus
The release of gas indicates that a chemical reaction is taking place at elecrodes
The electric energy is used to cause a chemical reaction
Hydrogen gas is released at cathode
Oxygen gas is released at anode
Volume of Hydrogen gas formed= 2 Volume of oxygen gas formed