The following graphs represent the behavior of BaCO3 under different circumstances. In each case, the vertical axis indicates the solubility of the BaCO3 and the horizontal axis represents the concentration of some other reagent. (a) Which graph represents what happens to the solubility of BaCO3 as HNO3 is added? [Section 17.5]

Video transcript

Welcome back everyone in this example we need to consider the graphs shown below, which shows how magnesium hydroxide behaves under different conditions. Were told that the Y axis in each graph represents the scalability of magnesium hydroxide and the X. Axis represents the concentration of another re agent identify the graph that corresponds to the scalability of magnesium hydroxide as hydrochloric acid is added to our solution. So our first step is to write out our reaction first for our base magnesium hydroxide which we should recall is going to undergo an equilibrium reaction where it associates into its ionic components where we form the magnesium two plus carry on and our hydroxide and ion. And to balance things out will place a coefficient of two in front of our hydroxide. Moving on to our reaction for hydrochloric acid. We will also have an equilibrium reaction where we form our H plus catalon and our chloride an ion. So these are our two reactions here. And based on what we've outlined in these reactions, we should recognize that our hydroxide from our magnesium hydroxide should be able to be react with our proton from hydrochloric acid. And if we know that according to the prompt, our X axis represents our concentration of another re agent. We can agree that if we increase our concentration of our hydrochloric acid then our sorry ability of our magnesium hydroxide should increase, which would follow the trend of our curb given in choice A. Whereas choice be. It appears that as we decrease the concentration of hydrochloric acid are scalability of magnesium hydroxide will decrease. But we know that that is not true. So we would rule out Choice B. We would also rule out Choice C. Because we don't see that the Celje bility of magnesium hydroxide should stay the same so we can agree that choice A would be the best graph as our final answer, which corresponds to our concentration of hydroxide as it's added to our solution of magnesium hydroxide will increase our susceptibility of magnesium hydroxide. So is our final answer. I hope everything I reviewed was clear. If you have any questions, leave them down below and I will see everyone in the next practice video.