Write a balanced equation for the overall cell reaction in the following galvanic cell, and tell why inert electrodes are required at the anode and cathode. Pt(s) | Br-(aq) | Br2(l2) || Cl2(g) | Cl-(aq) || Pt(s)

Video transcript

Hello. In this problem we are asked for the given cell notation to write an overall cell reaction. We are asked to explain why we need an inert electrode at the cathode. So recall then that when we write the cell notation, a single vertical line represents the difference between phases. So we have solid separated from acquis liquid separated from a quiz. And acquis separated from a solid. And that a double vertical line represents the salt bridge. On the left hand side we have the a note compartment and on the right hand side we have the cathode compartment and the reaction in the anodes and cathodes proceed as it is written in the cell notation from left to right. So that means then in the compartment we will have nickel metal being oxidized for nick alliance. And in the cathode we will have romaine liquid being reduced. Perform bromide ions are overall cell reaction. Then we have two electrons being lost in two games. So those will cancel. So we have nickel metal reacting with grooming for Nicole Lyons and throw my diamonds. And so this is our overall cell reaction. We are then asked why we have an inert electrode at the cathode. So we have platinum at the cathode. So we need to have a metal serve as an electrode romain is a liquid and it is also an insulator. So that's the reason for choosing the metal platinum. It also needs to be inert because we do not want it to react with the romaine. A number of religions will react with metals. Thanks for watching. Hope this helps