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Sulphates are usually soluble in water except for Ag2SO4, BaSO4, CaSO4 and PbSO4 (lead sulphate).

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PbSO4 is sparingly soluble in water, its solubility at 298K is about 1.4E-4 mol/L, a very small value. So its not insoluble, it just has a very small solubility.

Most sulphates of group 2 elements have low solubilities with the solubilities decreasing down the group, so that the sulphates of the top 2 elements, Be and Mg are reasonably soluble, then the solubilities decreasing for Ca, Sr and Ba. Other elements with very low solubilities for sulphates include Sb (antimony), Hg (Mercury, Ag (silver) and Pb (lead). The solubility of lead sulphate can apparently be increased by additio0n of acid or ammonia or both (or ammonium salts).
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15y ago

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