# Precipitation of a lead(II) sulfate

Lead (II) sulfate precipitate can be dissolved if:

The stability constant of $$\ce{Pb−EDTA}$$ complex is $$\ce{10^{18}}$$, which is huge. The solubility product of $$\ce{PbSO_4}$$ is $$10^{−8}$$ , which cannot be compared to the effect of $$\ce{EDTA}$$. So the precipitate $$\ce{PbSO4}$$ must be soluble in $$\ce{EDTA}$$ solutions. These numerical data have been taken from J. G. Stark, Chemistry Data Book, John Murray, London, $$1994$$