Boric Acid
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Boric Acid, or more specifically Orthoboric Acid, is a compound with three hydroxyl groups connected to a boron atom. The molecule has trigonal planar geometry centered at the boron atom. It is an odorless, water-soluble white solid.

The mineral form, found in nature, is known as Sassolite, and has been used since ancient times for cleaning and preservation. Industrially, it is generally prepared by reacting Borax with Hydrochloric Acid. Since it cytotoxic, it is useful as an antiseptic, antifungal, and antiviral agent, although the exact mechanism of action is still poorly understood. These properties make Boric Acid useful for certain medical treatments, including yeast infection, cold sores, and athlete's foot. It is also used as an insecticide, a pH buffer in swimming pools, and a plant nutrient.