Boric acid

Orthoboric acid
Structural formula	Space-filling model
Names
	IUPAC name Boric acid
	Other names Orthoboric acid, Boracic acid, Sassolite, Borofax, Trihydroxyborane, Boranetriol, Hydrogen borate, Acidum boricum
Identifiers
CAS Number	10043-35-3 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:33118 ;
ChEMBL	ChEMBL42403 ;
ChemSpider	7346 ;
ECHA InfoCard	100.030.114
EC Number	233-139-2;
E number	E284 (preservatives)
KEGG	D01089 ;
PubChem CID	7628;
UNII	R57ZHV85D4 ;
CompTox Dashboard (EPA)	DTXSID1020194 ;
	InChI InChI=1S/BH3O3/c2-1(3)4/h2-4H Key: KGBXLFKZBHKPEV-UHFFFAOYSA-N ; InChI=1/BH3O3/c2-1(3)4/h2-4H Key: KGBXLFKZBHKPEV-UHFFFAOYAI;
	SMILES OB(O)O; [OH+]=[B-](O)O;
Properties
Chemical formula	BH3O3
Molar mass	61.83 g·mol−1
Appearance	White crystalline solid
Density	1.435 g/cm3
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 in other solvents	Soluble in lower alcohols ; moderately soluble in pyridine ; very slightly soluble in acetone
log P	-0.29
Acidity (pKa)	9.24 (first proton), 12.4 (second), 13.3 (complete)
Conjugate base	Borate
Magnetic susceptibility (χ)	-34.1·10−6 cm3/mol
Structure
Molecular shape	Trigonal planar
Dipole moment	0 D
Pharmacology
ATC code	S02AA03 (WHO) D08AD (WHO)
Hazards
	GHS labelling:
Pictograms
NFPA 704 (fire diamond)	1 0 0
Flash point	Nonflammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	2660 mg/kg, oral (rat)
Related compounds
Related compounds	Boron trioxide; Borax
Supplementary data page
	Boric acid (data page)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Boric acid, more specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formula B(OH)₃. It may also be called hydrogen orthoborate, trihydroxidoboron or boracic acid.^[3] It is usually encountered as colorless crystals or a white powder, that dissolves in water, and occurs in nature as the mineral sassolite. It is a weak acid that yields various borate anions and salts, and can react with alcohols to form borate esters.

Boric acid is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other boron compounds.

The term "boric acid" is also used generically for any oxoacid of boron, such as metaboric acid HBO₂ and tetraboric acid H₂B₄O₇.

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