Question

Perform the electrolysis of water experiment to illustrate decomposition reaction. ​

Answer 1

Answer:

The electrolysis apparatus consists of 6 volt battery, two platinum electrodes. When a current from a 6 volt battery is sent through the water. The H+ and OH- ions move to oppositely charged electrodes. Hydrogen gas will bubble at cathode and the oxygen will bubble at anode

After electrolysis of water, hydrogen is collected at negative chose and oxygen is collected at positive anode. Hydrogen is double in volume than oxygen. 2H2O = 2H2 + O2.

Answer 2

Required Answer:

Materials required:

Plastic mug ,two graphite rods, teo test tubes, 6V battery, switch, two rubber Stoppers, sulphuric acid.

Procedure:

1. Set up the Apparatus as shown in figure.

2. Fill the mug with water such that graphite rods are immersed.Add a few drops of sulphuric acid.

3. Connect the electrodes to 6V battery and switch on the current. Leave the apparatus undisturbed for some time.

4. Formation of bubbles at both electrodes will take place.

5. The reaction that takes place is as follows:

$\sf\:2H_2O(l)\longrightarrow2H_2(g)+O_2(g)$

Hydrogen gas is collected in the test tube over the cathode while oxygen gas is collected in the test tube over the anode . It is interesting to note that volume of hydrogen collected is twice the volume of oxygen as explained by the above chemical equation . Hydrogen and oxygen gases can be identified as under:

Bring a buming candle near the tube placed over the cathode . A pop sound is produced ( hydrogen is a combustible gas ) .

Again , bring the burning candle near the tube placed over the anode . The flame gets brighter ( oxygen is a supporter of combustion ) .

Note:

Figure of this activity is attached above