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31146

Sigma-Aldrich

Boric acid

puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., buffer substance, ≥99.8%

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Linear Formula:
H3BO3
CAS Number:
10043-35-3
Molecular Weight:
61.83
EC Number:
233-139-2
MDL number:
MFCD00011337
UNSPSC Code:
12352106
eCl@ss:
38120104
PubChem Substance ID:
329753669
NACRES:
NA.21

grade

ACS reagent
puriss. p.a.

Quality Level

200

Agency

USP/NF
reag. ISO
reag. Ph. Eur.

vapor pressure

2.6 mmHg ( 20 °C)

Assay

≥99.8%

form

powder or crystals

impurities

≤0.005% insoluble in methanol
≤0.05% with methanol-HCl non-volat. matter

pH

3.6-4.0 (20 °C, 4%)

mp

160 °C (dec.) (lit.)

solubility

water: soluble

density

1.440 g/cm3

anion traces

chloride (Cl-): ≤3 mg/kg
phosphate (PO43-): ≤5 mg/kg
sulfate (SO42-): ≤5 mg/kg

cation traces

As: ≤5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤1 mg/kg
Mg: ≤5 mg/kg
Pb: ≤5 mg/kg
Zn: ≤5 mg/kg

SMILES string

OB(O)O

InChI

1S/BH3O3/c2-1(3)4/h2-4H

InChI key

KGBXLFKZBHKPEV-UHFFFAOYSA-N

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General description

Boric acid can be used as a Lewis acid catalyst in organic synthesis to facilitate various organic reactions, including dehydration, hydrolysis, decarboxylation, and condensation reactions. It produces different borate anions and salts and can react with alcohols to produce borate esters. It is also used as a buffering agent and pH adjuster.
Boric acid is a very weak acid, having pH in the range of 3.6-4.0. Coulometric method for the determination of boric acid has been reported.

Application

Boric acid can be used as a precursor to synthesize boron carbon oxynitride thin films by the atmospheric pressure chemical vapor deposition (APCVD) method using carbon-rich methane and nitrogen-rich ammonia.

Pictograms

Health hazard
GHS08

Signal Word

Danger

Hazard Statements

H360FD

Hazard Classifications

Repr. 1B

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Information

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Catanzaro EJ, et al.
Boric Acid: Isotopic and Assay Standard Reference Materials, 1-1 (1970)
L Charlet Bhami et al.
Journal of vector borne diseases, 52(2), 147-152 (2015-06-30)
The use of low concentrations of boric acid as a potential and effective control agent for the eggs and immature stages of Aedes aegypti L. and Aedes albopictus Skuse (Diptera: Culicidae) is found to be safe and effective as compared
One-pot synthesis of 3, 4-dihydropyrimidin-2(1H)-ones using boric acid as catalyst.
Tu S, et al.
Tetrahedron Letters, 44(32), 6153-6155 (2003)
L Romano et al.
The Journal of antimicrobial chemotherapy, 55(1), 110-114 (2004-12-03)
There is very little information, to date, on the antifungal activity of bergamot oil. In this study, we investigated the in vitro activity of three bergamot oils (natural essence, furocoumarin-free extract and distilled extract) against clinically relevant Candida species. We
Hye Ryeo Lee et al.
Journal of chromatography. A, 1346, 117-122 (2014-05-09)
In liquid phase microextraction, high enrichment factors can be obtained using an acceptor phase of small volume. By hanging an acceptor drop at the separation capillary tip, single drop microextraction (SDME) can be in-line coupled with capillary electrophoresis (CE). The
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