![]() This is a common laboratory test to determine if sulfate anions are present. The barium derivative is useful in the gravimetric analysis of sulfate: if one adds a solution of most barium salts, for instance barium chloride, to a solution containing sulfate ions, barium sulfate will precipitate out of solution as a whitish powder. Radium sulfate is the most insoluble sulfate known. Exceptions include calcium sulfate, strontium sulfate, lead(II) sulfate, barium sulfate, silver sulfate, and mercury sulfate, which are poorly soluble. There are numerous examples of ionic sulfates, many of which are highly soluble in water.
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