When lithium iodide (LiI) is dissolved in water, the solution becomes hotter. c. Sketch a qualitative energy diagram similar to Figure 13.7 for the dissolution of LiI.

Video transcript

Hello everyone in this problem. Been told that the solution becomes hotter when sodium bromide, any br salt is being dissolved in water. We have to give the qualitative energy diagram for the dissolution of sodium bromide. So for my delta H of lattice energy, this is the heat needed to break the lattice structure into gaseous ions. So heat is required. Hence this positive sign. So again this is the heat to break lattice into gasses ions. Alright then we have our delta H. For hydration. And this is the heat released when gasses as dissolved in large amounts of wire to form a solution he has released and hence we have a negative sign. Again this is heat released when gashes ions form solution. Alright now for my delta age of solution is the sum of the delta H of energy and the delta H of hydration. I'll just put the submission sign of the delta age of the L. E. Selous energy and the delta age of hydration which I'll just put as H. Y. D. So the if the overall the solution results to increase in temperature then the delta H. Of the solutions exist. Thermic and heat is released to have a negative delta age of solution. The magnitude of delta H. Hydration must be greater than the magnitude of the delta H. Of the last energy. And is shown in this graph that we need to go ahead and draw. So for an energy diagram of course let's just scroll down here from our space. So we need this they're going up. It's mean that as we go up we have increasing energy and of course we have our N. A. B. R. This must be lower than this. Nice raider. Actually, this must be greater or lower than this, N. A. Plus in cash a state. And the B. R minus in its gaseous state. And the lost an energy of the mom is going to be the N. A. Plus in its liquid state and the B. R minus in its liquid state. And these are both ions and its states. So we see here we have solid gas. And so over on the left here, we also need to draw these arrows. So this was going down If we extend this here, this goes up of course this just goes down here. Alright, so over on the left here we have this delta H. Of lattice energy and over at the bottom we have the delta H. Of the solution. No. All the way to the right here, we have the delta age of dehydration. Alright, so my final answer is going to be this. I had your diagram over here