I was hoping you could help me out with a problem.
The question reads,
"What is the solubility of silver sulphide in pure water? HINT: This is actually an acid-base equilibrium situation involving a diprotic acid and combined equilibria. Ksp (Ag2S) = 6 x 10-50 M3"
When I first looked at it, I thought it was a simple solubility question.
Ag2S dissociates into 2Ag+ and S2-
and using an ICE table and the Ksp, you figure out the solubility.
however my prof keeps talking about how you need to combine equilibria, solve 6 unknowns using 6 equations, etc.
so i get the feeling there is more to this question (plus its out of 15 marks...)
i know that i can find the Ka for the dissociation of diprotic H2S, etc.
but my intuition still tells me that solubility is related to Ksp and since i'm given Ksp, i can just find solubility using an ICE table, etc...
can anyone point me in the right direction?
thanks in advanced.