Question

How do I know if this is spontaneous at 25 celsius and show work?


PbCl2 --->(equilibrium)--->Pb2+ + 2Cl-

a) when Pb2+=1M and Cl-=2M

b) when Pb2+=1X10^-5 and Cl-=2X10^-5

Answer 1

I don't understand your question. Is this in solution? In solution, of course PbCl2 will spontaneously dissolve although not completely. Do you mean will there be a precipitate? For that compare Qsp with Ksp. If Qsp > Ksp, yes. If Qsp < Ksp, no.