The purpose of two half cells in a galvanic cell is:

Explanation

In a galvanic cell, two half cells are employed to facilitate the redox reaction by separating the oxidation and reduction reactions physically. The purpose of having two half cells is to prevent direct mixing of the reactants, thereby allowing controlled electron flow through the external circuit.Each half cell consists of an electrode immersed in an electrolyte solution. These solutions facilitate the flow of ions necessary for charge balance and complete the circuit. However, there is no direct chemical reaction between the solutions of the two half cells. Instead, a salt bridge or a porous barrier is used to allow the flow of ions between the two half cells, maintaining electrical neutrality and completing the circuit without the solutions mixing.