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Boric acid
Names
IUPAC names
Boric acid
Trihydrooxidoboron
Other names
Orthoboric acid,
Boracic acid,
Sassolite,
Optibor,
Borofax,
Trihydroxyborane
Identifiers
CAS number 10043-35-3
PubChem 7628
EC number 233-139-2
KEGG D01089
ChEBI CHEBI:33118
SMILES OB(O)O
Properties
Molecular formula H3BO3
Molar mass 61.82 g mol-1
Appearance White crystalline solid
Density 1.435 g/cm3
Melting point

170.9 °C, 444 K, 340 °F

Boiling point

300 °C, 573 K, 572 °F

Solubility in water 2.52 g/100 mL (0 °C)
4.72 g/100 mL (20 °C)
5.7 g/100 mL (25 °C)
19.10 g/100 mL (80 °C)
27.53 g/100 mL (100 °C)
Solubility in other solvents Soluble in lower alcohols
moderately soluble in pyridine
very slightly soluble in acetone
Acidity (pKa) 9.24 (see text)
Structure
Molecular shape Trigonal planar
Dipole moment Zero
Hazards
EU classification Harmful (Xn)
Repr. Cat. 2
NFPA 704

NFPA 704.svg

0
2
0
 
R-phrases R60 R61
S-phrases S53 S45
Flash point Non-flammable.
Related compounds
Related compounds Boron trioxide
Borax
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Boric acid is an acid of Boron. Its salts are called Borates. Boric acid is used as a disinfectant. It can also be used as a preservative, it has the E number 284. Boric acid is a by-product of the production of certain forms of glass, porcelain and vitreous enamel. It is also used as a Flame retardant. Dissolved in water, it acts as a neutron absorber in nuclear power plants.

Boric acid is toxic. Damage is done from absorbing or ingesting about 50 mg, per kg of body weight.

Boric acid is one of the chemicals on the REACH list of the European Union. In 2010, the European Chemicals Agency listed it as a Substance of very high concern. Boric acid causes birth defects; it is a teratogen. This is also true for mixtures that contain boric acid in a concentration of at least 5.5%.

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