H3BO3; a weak acid, with antiseptic properties. Dilute solutions have a pH of about 6, while partially neutralized solutions have a pH of about 9. Salts of boric acid are called borates. Hydrated boron(III) oxide (B2O3) is also called boracic acid.
| Boric acid | |
|---|---|
| General | |
| Other names |
Orthoboric acid, Boracic acid, Sassolite, Optibor®, Borofax® |
| Molecular formula | B(OH)3 |
| Molar mass | 61.832 g/mol |
| Appearance | White crystalline solid |
| CAS number | [10043-35-3] |
| Properties | |
| Density and phase | 1.435 g/cm³, solid. |
| Solubility in water | 5.7 g/100 ml (25°C) |
| Melting point | 169°C decomp. |
| Acidity (pKa) | 9.24 (see text) |
| Structure | |
| Molecular shape | Planar |
| Crystal structure | ? |
| Dipole moment | Zero |
| Thermodynamic data | |
|
Standard enthalpy of formation ΔfHsolid |
−1093.99 kJ/mol |
|
Standard molar entropy Ssolid |
88.7 J.K |
| Hazards | |
| MSDS | External MSDS |
| EU classification | N/A |
| NFPA 704 | 1 0 0 |
| Flash point | Non-flammable. |
| Supplementary data page | |
|
Structure and properties |
n, εr, etc. |
|
Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Related compounds |
Boron trioxide Borax |
|
Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references |
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Boric acid, also called boracic acid or orthoboric acid, is a mild acid often used as an antiseptic, insecticide, flame retardant, in nuclear power plants to control the fission rate of uranium, and as a precursor of other chemical compounds. (Toxicity ref: http://www.natbat.com/docs/boron.htm)
Boric acid can be used to treat yeast and fungal infections such as candidiasis (vaginal yeast infections) by filling gelcaps with boric acid powder and inserting two into the vaginal canal at bedtime for three to four nights in a row.
Lithium boric acid is the lithium salt of boric acid and is used in the laboratory as buffer for gel.
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