barium carbonate

noun Chemistry.
a white, poisonous, water-insoluble powder, BaCO 3 , used chiefly in the manufacture of rodenticides, paints, and dyes.

Origin:
1870–75

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Two forms of barium, barium sulfate and barium carbonate, are often found in nature as underground ore deposits.
Barium carbonate and sulfate are poorly soluble in water.
Barium carbonate is then added to remove sulfates which precipitate out as barium sulfate.
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