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Boric acid

Boric acid, also called hydrogen borate, boracic acid, orthoboric acid and acidum boricum, is a weak, monobasic Lewis acid of boron, which is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds. It has the chemical formula H3BO3 (sometimes written B(OH)3), and exists in the form of colorless crystals or a white powder that dissolves in water. When occurring as a mineral, it is called sassolite.

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Further Information

Names

IUPAC namesBoric acid
Trihydrooxidoboron

Other names

Orthoboric acid,
Boracic acid,
Sassolite,
Optibor,
Borofax,
Trihydroxyborane,
Boron(III) hydroxide,
Boron Trihydroxide

Identifiers

CAS Number: 10043-35-3

JSmol: Interactive image

ChEBI: CHEBI:33118

ChEMBL: ChEMBL42403

ChemSpider: 7346

ECHA InfoCard: 100.030.114

EC Number: 233-139-2

E number: (preservatives)

KEGG: D01089

PubChem: 7628

UNII: R57ZHV85D4

Properties

Chemical formula: BH3O3

Molar mass: 61.83 g·mol

Appearance: White crystalline solid

Density: 1.435 g/cm

Melting point: 170.9 °C (339.6 °F; 444.0 K)

Boiling point: 300 °C (572 °F; 573 K)

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: alcohols

log : -0.29

K: 9.24, 12.4, 13.3

Magnetic susceptibility: -34.1·10 cm/mol−63

Structure

Molecular shape: Trigonal planar

Dipole moment: Zero

Pharmacology

ATC code: WHOS02AA03

Hazards

Safety data sheet: See:

EU classification:

R-phrases: R60 R61

S-phrases: S53 S45

NFPA 704:

Flash point: Non-flammable

median dose: 2660 mg/kg, oral (rat)

Related compounds

Related compounds: Boron trioxide

Supplementary data page

Structure and
properties: n

Thermodynamic
data: Phase behaviour

Spectral data: UV

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).