Ksp vs. Keq

[Chlost]

How do these relate, what are the formulas for each, and what effects each... I think I may be confusing these, thanks

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[bonez318ti]

Keq is the equilbrium constant
Ksp is the solubility constant

They are related in that Ksp is a type of Keq, but Ksp only deals with how soluble something is under specific conditions.

Keq is alot more general, and is usually used to designate what a reaction looks like at equilibrium (ie: max. entropy). The reaction type can be varied, ranging from a salt dissolving (Ksp), an Acid disassociating (Ka) etc..

The formula for any type of Keq is always [products]/[reactants]. There are specific rules though.. but in general, this equation works.

 

[mdsquared]

For Ksp: for example, lets say you have the following:
PbI2 (s) yields Pb+ (aq) + 2I- (aq)

then Ksp = [Pb+][I-]^2

You do not put solids into the equation.