18. Aqueous Equilibrium
Solubility Product Constant: Ksp
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Now when it comes to KSP calculations, realize that solubility is an equilibrium process. Hence, calculations will require an ICE chart. So if you see KSP within a question, that means you're most likely going to have to use an ICE chart. Now here with KSP, we have a formula we need to remember. So let's say that here we have our equation. Again, KSP deals with the solubility of ionic solids, which means that you're going to start out with an ionic solid as your reactant. We look to see how it breaks up into various ions. So let's say that it breaks up into some unknown number of B ions plus some unknown number of C ions. These are ions where they'd have charges, so I'm just gonna write a random charge here for each one. Now a, b, and c are your coefficients. Ksp is an equilibrium constant, and like all equilibrium constants, it equals products over reactants. However, remember, we said Ksp deals with solids. Remember, solids and liquids are ignored. So although Ksp equals products over reactants, Like other equilibrium constants, the reactant will be a solid and therefore can be ignored. So KSP simplifies to just equal to products. Now like other equilibrium constants, we'd have our products within brackets represent concentrations, and then remember that their coefficients would become these powers. Okay? So that's how we break down the equilibrium expression for a Ksp value. Okay? So just remember, it's equal to products over reactants. The reactant is a solid, so just drop it. So Ksp equals products.
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