Is the solubility of Zn(OH)2 increased, decreased, or unchanged on addition of each of the following substances? Write a balanced net ionic equation for each dissolution reaction. (See Appendix C.6 for formulas of complex ions.) (a) HCl

Video transcript

Welcome back everyone. We're told that nickel to hydroxide is sparingly soluble or is a sparingly soluble hydroxide will it's solid ability increase, decrease or remain unchanged when a small amount of hydrochloric acid is added to a solution of nickel to hydroxide, write a balanced net ionic equation for the dissolution reaction. If it takes place, recall that in a dissolution reaction or solid substance which is our salute in this case that is our nickel to hydroxide. This solid substance and a dissolution is going to disassociate into the following ions where we would have the nickel to plus cat ion in solution with two moles of hydroxide. It's important that we have these two moles of hydroxide because we need it to be bounced out with our two moles of hydroxide on the reactant side. Given from this subscript and recognize that the nickel cat down is a two plus charge because in our ionic compound here, which consists of our metal nickel and are non metals hydroxide, we have the transfer of electrons and so we know that this subscript two next to hydroxide represents the two electrons that were transferred from nickel here. So now let's go ahead and recognize that we need to figure out how our product ions being our nickel carry on and our hydroxide are going to affect the direction of equilibrium are solid complex is not going to affect the direction of equilibrium because it's solid. But because our products are acquis, they will affect equilibrium. So we're going to want to recall last shot liaise principle, recall that last shot lee's principle tells us that if we increase the products, our reaction is going to proceed in the direction of our reactant. So the arrow for the equilibrium would be longer towards the direction of our reactant and that would attain equilibrium. Whereas if we remove one of our products, the reaction is therefore going to be longer in the equilibrium arrow for the direction towards our products, where the arrow is smaller in the direction towards our reactant and this is going to make up for the loss of our products. Now, according to the prompts, we are going to be adding a small amount of hydrochloric acid, recall that hbr or hydrochloric acid is one of our memorized strong assets. And so it's going to be a strong electrolyte, meaning that it's going to fully dissociate into one mole of protons and one mole of bromide, an ion and our protons here from our asset are going to react with our hydroxide and ions from our solid. And so we would have hpe lus reacting with hydroxide. And recall that these two will form water. And based on this reaction, we would therefore lose hydroxide from our dissolution of nickel to hydroxide. So instead, I'd rather write this out as our concentration therefore of hydroxide is going to decrease. And so we would be losing product. So equilibrium is going to actually be longer in the arrow for the direction towards our nickel to hydroxide where the arrow towards our product being our nickel two plus catalon and our two moles of hydroxide would have a smaller arrow in the four direction. So because our constant or our equilibrium arrow proceeds in the reverse direction, that means more of our nickel hydroxide will dissolve, Making up for the loss of our hydroxide ions. And if more of our solid nickel to hydroxide dissolves this will thus increase or increases the salt ability of nickel to hydroxide. So for our final answer, we can confirm that we have our balanced net ionic equation, which I'm highlighting here in yellow as well. As we can confirm that the with the addition of hydroponic acid to our solution, this would increase the scalability of nickel to hydroxide. What we have highlighted in yellow as our final answers correspond to choice C. In the multiple choice as our final answer. I hope everything I went through is clear. If you have any questions, please leave them down below and I'll see everyone in the next practice video