Question

How many components and phases are in an equilibrium system comprising lead sulfate, lead ions, and sulfate ions?

Answer 1

I am going to calculate the degrees of freedom (F=C−P+2) on the following system, but I can't figure out whether we have to take PbSO4, Pb2+ and SO42− as a single component and single phase, or PbSO4 and Pb2+, SO42− as 2 components and 2 phases?