Dilute H2SO4 was taken in an electrolytic cell and electric current was passed through it.

Question

Write down the changes that will be seen in each instance and explain the reason behind it.

Dilute H₂SO₄ was taken in an electrolytic cell and electric current was passed through it.

Answer 1

When a dilute solution of sulfuric acid is electrolysed, gases are produced at both the anode and the cathode electrode.

The gas produced at the cathode burns with a 'pop' sound, when a sample is lit with a lighted splint. This shows that the gas is hydrogen.

2H⁺ +2e^- → H₂

The gas produced at the anode relights a glowing splint dipped into a sample of the gas. This shows that the gas is oxygen.

4OH^- - 4e^- → 2H₂O + O₂

The gases are produced when ions move towards the electrodes.