The Nernst Equation

by Jules Bruno
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So if we take a look at this question, it says, answer each of the following questions based on the following half reactions. So for party asked, which is the strongest oxidizing agent. So let's think of this in terms of a road map. So oxidizing agent means that you've been reduced and if you've been reduced, that would mean that you are the Catholic and if you're the cathode, that must mean you have the largest e value. And if you've been reduced, that means that you are next to the electrons. All right, so to be able to do this, make sure all the electrons are on the same side. For all behalf, reactions and all the half reactions, the electrons are reacting. So we're good now that they're all on the same side. We can just look at the e values largest value would be of the first equation. It's 1.36 and so we know that would represent the cathode because reduction is happening. We're looking for the elements or ion next to the electrons. So here go the electrons that we have. Who's next to them? Chlorine gas is next to them, so the answer here is BCL two gas. Now let's say that they all didn't have the electrons as reacting bowl we do. Let's say that we had another equation. Br to let's say we have br two of them and we had the electrons on the product side on. Let's say here that it's e value waas negative 0. So that's not it's actual number. I'm just making it up here. This won't be the odd one out. Everyone else has their electrons on the react inside, which is the side you really wanted to be on its on the product side. What will we do? We would reverse this reaction. So the products have become reactions and the reactor and become a product. What effect is reversing the reaction? Have reversing The reaction would reverse the sign of e r self potential have become positive point for 10 So again, make sure all the electrons are on the same side. Probably the react inside if they're not reverse the reaction so that they are. When you reverse the reaction, it flips the sign off yourself potential, which is delta, which is delta Eat. All right, So now that we've answered that one, let's take a look at another one. So we're looking for the strongest reducing agent reducing agent here means you've been oxidized, which means you are the an ode normally added would have the smallest e value and realize that you've been oxidized. That would mean that you are losing electrons, so you're gonna be away from electrons. So if you go back up, this equation has the smallest value. And here are the electrons. Since we're being oxidized, we don't wanna be on the same side with them. So the answer here would be vanadium solid. So the V solid. So that would be your answer here. And then finally, we'll I minus reduced call to to see l minus. So if I minus is reducing CEO, that means that I minus is being oxidized, which means that it should have the smaller e value. So if we look, does I minus have a smaller e value than cl? Yes, it does its point 535 versus 1. So we'd say Yes, I minus will be oxidized and in the process, cl two will be reduced. So that's how we compare different half reactions to each other, and it's all based on the given some potential that we have for each half reaction.