Assume that you want to construct a voltaic cell that uses the following half-reactions: A2+1aq2 + 2 e- ¡ A1s2 Ered ° = -0.10 V B2+1aq2 + 2 e- ¡ B1s2 E°red = -1.10 V You begin with the incomplete cell pictured here in which the electrodes are immersed in water.

(a) What additions must you make to the cell for it to generate a standard emf?

Video transcript

Welcome back everyone assume you want to use the below half reactions to make a voltaic cell. Starting with the incomplete cell with the electrodes immersed in water as shown below. Which of the following should you add to the cell to make it produce a standard E M. F. Recall that E M F stands for electric magnetic force. We want to recall our first fact which is that ions in a solution have a standard concentration of one molar. And we also want to recall that for a standard electric magnetic force and we'll put that in all caps here for a standard electric magnetic force are ions must flow in a complete circuit. So for our deuterium three plus catalon solution and our carbon three plus catalon solution, we're going to need to connect these two solutions via the salt bridge. As you can see in our voltaic cell set up here. And this will allow for that flow of ions from the first speaker to the second beaker. So we'll say the salt bridge allows flow of ions between beakers and so with these notes listed, we're going to go to our answer choices and we can confirm that the only answer choice that matches the description of our notes that we outlined above is going to be statement or choice A which says that we add one molar of our carbon three plus carry on and one molar of our deuterium three plus cattle onto the beaker with the carbon metal electrode and deuterium metal electrode respectively. And then we're also going to add a salt bridge between the two beakers. So statement A is going to be our final answer to complete this example as the best way to make our voltaic cell produce a standard electric magnetic force. I hope everything I reviewed was clear. If you have any questions, leave them down below and I'll see everyone in the next practice video.