 Write the correct formula equation complete ionic equation and that ionic equation For the reaction between cobalt 2 fluoride and sodium hydroxide. Okay, so cobalt 2 fluoride You could put this as solid or aqueous, right? But eventually you're going to want it to be aqueous. So sometimes on those problems you might see it as solid You got to remember that will be Plus what do we say sodium hydroxide? Sodium hydroxide goes to, well So this is where you've got to know what it's going to go to So how do I know that? Does anybody know what the products would be? What kind of reaction is this going to be? Double displacement reaction. So what do they do? They do the do-shido, they switch parts, right? So what is going to be the react, the product? So sodium chloride and cobalt hydroxide. Yes Okay, so CO But what's the oxidation state of cobalt? 2. And what's the charge on hydroxide? Negative 1. So what do we have to have? Cobalt That right? Okay. Is this insoluble this thing? You guys know? It's insoluble. Hydroxides, okay? Those things with oxygen are a lot of times insoluble. Okay, so And then the other way you know is sodium chloride, soluble or insoluble? It's not the sodium chloride Okay, so is this equation balanced? No, so we're going to have to balance it, right? Balance, balance, right? Okay, so they call that, in this case they call it the formula equation. You might hear it the molecular equation I often call it that. So we'll just call it the formula equation just to give it a different name today. Okay, so the next thing we've got to do is the what? The total ionic equation, right? So anything that has aqueous, break it up. The sub-script goes in front talking about both the sodium and the hydroxide, of course. This thing stays, what are we going to do now? Cancel our spectators, yes, very good. So tell me, I'm going to put my hand underneath and you say yes if it's a spectator, okay? Or no if it's not. Why do you say those ones? They're on both sides, both sides of the equation. And of course the ratio. So now what do we do? Total are the, this is the actual reaction that's going on in this thing? So let's say spectators, the C L minus, they'll put 2s in front of us, you know what I mean? Everybody okay with that one? Do we have to write spectators down? It just asks, you know, I mean in most of the ones that I posted on there I like to ask it because you might as well ask it. How did I know, well, all of these ones are double displacements when you're forming a precipitate. I mean, so what did it say in this one? It says this one didn't necessarily say it, but you should know that when you react cobalt chloride and sodium hydroxide that's going to form a precipitate. Because cobalt hydroxide is insoluble and you know your solubility. Okay, so these are all whenever you see these solubilities, this is what they're pushing on you. Any other questions on this one? Pardon? Yes, solid, solid, solid, solid. Yes, put solid. Any other questions? Quick, quick, quick.