oxalic acid

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oxalic acid (oks-al-ik) n. an extremely poisonous acid found in many plants, including sorrel and the leaves of rhubarb, and in some bleaching powders. When swallowed it produces burning sensations in the mouth and throat, vomiting of blood, breathing difficulties, and circulatory collapse. Treatment is with calcium lactate or other calcium salts, lime water, or milk. Formula: C2H2O4.

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