Asked by alex

Why do the concentrations of Pb 2+ and SO4 2- ions in a saturated solution of PbSO4 in contact with solid PbSO4 remain the same when the solution evaporates to half of its original volume?

it has to do with equilibrium.

Answers

Answered by DrBob222
PbSO4(s) ==> Pb^2+(aq) + SO4^2-(aq)
Ksp = (Pb^2+)(SO4^2-)
As the solvent evaporates, Ksp must stay the same; therefore, PbSO4 must come out of solution to keep the ion product the same.





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