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Sulphate
Many examples of ionic sulfates are known, and many of these are highly
soluble in water. Exceptions include calcium sulfate, strontium
sulfate, and barium sulfate, which are poorly soluble. The barium
derivative is useful in the gravimetric analysis of sulfate: one adds a
solution of, perhaps, barium chloride to a solution containing sulfate
ions. The appearance of a white precipitate, which is barium sulfate,
indicates that sulfate anions are present.
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