 Okay, so let's do the equilibrium constant for this first. We're going to eventually talk about this at least principle Okay, so in order to do the equilibrium constant Right, it's going to be the products over the reactants But it's going to be the things that are only gaseous and aqueous. Okay, so when we look at that It's going to be water concentration of water all their concentration And we're not going to put sulfur in that expression why because it's a pure soul Just like what you guys said So like what I said now we're going to talk about the shadowy is principal So it's only things that are in the equilibrium constant that will affect the shadowy is principal Okay, so let's try this problem What will happen to the concentration of H2O gas if I O2 gets so I'm adding that what's going to happen to this Increase right this is going to increase If I add O2 does that make sense to everybody? Okay What's going to happen to? Okay, I'm going to raise that one now. What's going to happen to the concentration of H2S if O2 is that so if I add O2 what's going to happen to this concentration? decrease why Because the reaction is going that way. Okay, so this is going to decrease. Does that make sense? This is the shadowy is principal function. Okay So what would happen to? So can I raise that now? So what would happen to the concentration of oxygen? If I took H2S out What would happen to this? It would go up right why is the reaction is going this way. Okay, so this is going to increase Does that make sense? Okay, and What? So I'm going to raise that now and now the trick question But I don't want everybody to freak out. Okay, what's going to happen to this if I add more of this? Nothing, why? It's not in the equilibrium constant expression or because it's a pure salt, right? So everybody cool with that. Okay, so if it was If it was a gas then it would push this stuff, right? If it was aqueous it would have pushed it down Okay, so that's what would happen to this concentration any questions?