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Sigma-Aldrich

Boric acid

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

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About This Item

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.

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

signalword

Danger

hcodes

H360FD

Hazard Classifications

Repr. 1B

Storage Class

6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Catanzaro EJ, et al.
Boric Acid: Isotopic and Assay Standard Reference Materials, 1-1 (1970)
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
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
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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