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 $\ce{PbSO4}$, $\ce{Pb^2+}$ and $\ce{SO4^2-}$ as a single component and single phase, or $\ce{PbSO4}$ and $\ce{Pb^2+}$, $\ce{SO4^2-}$ as 2 components and 2 phases?


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