Question

Write chemical reactions that occurs in Nelson's cell .

Answer 1

The graphite anodes are suspended into the brine. During electrolysis, Cl ions are oxidized at the anode and chlorine gas goes out of the cell, while sodium ions are reduced at the mercury cathode forming sodium amalgam. ... Hydrogen gas is obtained as a by–product at the cathode.

Answer 2

The chemical reaction that occurs in Nelson's cells is:

$2H_{2}O(l) → 2H _2(g) + O _ 2(g)$

• Nelson's cell is an electrochemical cell used for the oxygen evolution reaction. It consists of a platinum anode and an inert anode. Both electrodes are immersed in an aqueous solution of potassium hydroxide (KOH). During the reaction, water molecules are split at the Pt anode and the oxygen molecules are produced to enter the bulk solution. At the inert anode, electrons are generated due to the reduction of O2 and they migrate to the Pt anode, enabling the reaction to take place. The overall reaction can be written as:
• 2 Water(l) → 4Hydrogen ion(aq) + Oxygen (g) + 4e−
• The electrons generated at the inert anode are ultimately given to the Pt anode and the reaction reaches completion. This can be represented as:
• 4e− + 4Hydrogen ion(aq) → 2 Hydrogen(g)

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