32: Boric Acid

H3BO3 [B2O3•3H2O]

Rev. 1.0

Boric acid, also called boracic acid, or orthoboric acid, H3BO3 [B2O33H2O] is a colorless (white),transparent, crystalline solid made by adding hydrochloric or sulfuric acid to a solution of borax (AMP:37), and crystallizing. Boric acid is used as a preservative and weak antiseptic; in the tanning industry it is used for deliming skin by forming water-soluble calcium borates; it is also used as a flux in brazing and soldering. PLM, Microchemical Testing, FTIR, and Raman are all useful techniques used in the identification of this material.