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Severely corrosive to eyes, skin and other tissue; considerable heat of dilution with water; mixing with water may cause spraying and spattering. Solutions might best be made by immersing the mixing vessel in an ice bath. Even very dilute solutions are harmful to eyes and skin. Always add the acid to water, never the reverse; extremely hazardous in contact with finely divided materials, carbides, chlorates, nitrates and other combustible materials. LD50 2140 mg/kg. TLV 1 mg/m3.
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