K in genchem

[joonkimdds]

Advertisement - Members don't see this ad

I know the differences among
Ka, Kb, Kw, Ksp

but I can't tell the differences among
Kc, Kp, Keq, K

even though the problems are asking for different K, they all end up with same eqution, Kc, Kp, Keq, K = [product] / [reactant]
should I assume that they are the same?

and do we only consider (g) and (aq) for K but not (l) and (s) ????

 

[anesthesia_209]

When calculating K, don't include solids and liquids.
Keq = Kc (c=concentration) = use molarity
Kp (p=pressure) = use partial pressure

 

[joonkimdds]

Does it apply to the La chattellel(sorry for mispelling it, but equilibrium theory)?
It says that adding more of liquid or solid doesn't affect the equilibrium but
adding more concentration of gas does.
But I am not sure if adding more of (aq) also affect the equilibrium just like how only
(g) and (aq) count for K.

 

[anesthesia_209]

Does it apply to the La chattellel(sorry for mispelling it, but equilibrium theory)?
It says that adding more of liquid or solid doesn't affect the equilibrium but
adding more concentration of gas does.
But I am not sure if adding more of (aq) also affect the equilibrium just like how only
(g) and (aq) count for K.

By changing aqueous or gaseous concentrations (amongst other things, such as heat, volume etc.), you disturb the equilibrium. (you can see this in the equilibrium equation because it is only composed of gaseous and aqueous substances). The equation doesn't consider solids or liquids, which is why you don't take them into consideration.