Question

In the electrolysis of water:

(i) Why is the volume of gas collected over one electrode double that of gas collected over the other electrode?

(ii) Why one or two drops of sulphuric acid is added into water?

(iii) Write the chemical equation for the chemical change occurs at cathode and at anode respectively.(Form the chemical equations only!)​

Answer 1

Answer:

Explanation:

1)Water composition is 2atoms of H and 1atom of O . Therefore H is double than O . The two electrodes collect H and O separately . We know that hydrogen composition in water is double than oxygen , so we find volume of gas collected in one electrode is double than volume of gas collected in another electrade

2) To increase the conductivity of water a few drops of sulphuric acid is added . Being a strong acid it can ionize completely to release H+ ions. These H+ ions are responsible for the conduction of electricity

3)The battery operates through electrochemical reactions called oxidation and reduction. ... The opposite process, the gain of electrons, is called reduction. Oxidation occurs at the Anode. Reduction occurs at the Cathode.