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Boric acid CAS#10043-35-3
CAS Number: 10043-35-3
Chemical Formula: BH3O3
Synonyms:
Boric Acid, Powder, Reagent
Boricacid,99.8%
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Appearance: White Powder
Boric acid is a monobasic acid that exhibits extremely weak acidity (Ka = 5.8 × 10⁻¹⁰), similar to silicic acid (K₁ = 2 × 10⁻¹⁰). Upon ionisation in water, it does not donate protons directly but instead forms a complex with hydroxide ions present in the solution:H₃BO₃ + 2H₂O → H₃O⁺ + B(OH)₄⁻
This behaviour is related to the electron-deficient nature characteristic of boron compounds. In boric acid, the boron atom acts as an electron pair acceptor by bonding with a hydroxide ion, where the oxygen atom serves as the electron pair donor. Thus, boric acid is considered a typical Lewis acid.
When glycerol or mannitol [CH₂(OH)(CHOH)₄CH₂OH] is added to a boric acid solution, its acidity increases. This is because boric acid forms a coordination complex (anion) with glycerol, which facilitates the release of H⁺ ions, thereby enhancing ionisation.
Boric acid Chemical Properties |
Melting point | 160 °C (dec.) (lit.) |
Boiling point | 219-220 °C (9.7513 mmHg) |
bulk density | 400-600kg/m3 |
density | 1.440 g/cm3 |
vapor pressure | 2.6 mm Hg ( 20 °C) |
refractive index | n20/D 1.330-1.340 |
storage temp. | Store at +5°C to +30°C. |
solubility | H2O: soluble |
pka | 8.91±0.43(Predicted) |
form | working solution |
color | ≤10(APHA) |
Specific Gravity | 1.435 |
Odor | Odorless |
PH | 3.6-4.4 (25℃, saturated solution in H2O) |
PH Range | 3.8 - 4.8 |
Water Solubility | 49.5 g/L (20 ºC) |
λmax | λ: 260 nm Amax: 0.05 |
Sensitive | Hygroscopic |
Merck | 14,1336 |
BRN | 1697939 |
Exposure limits | ACGIH: TWA 2 mg/m3; STEL 6 mg/m3 |
Cosmetics Ingredients Functions | BUFFERING |
Cosmetic Ingredient Review (CIR) | Boric acid (10043-35-3) |
InChI | 1S/BH3O3/c2-1(3)4/h2-4H |
InChIKey | KGBXLFKZBHKPEV-UHFFFAOYSA-N |
SMILES | OB(O)O |
LogP | -1.09 at 22℃ |
CAS DataBase Reference | 10043-35-3(CAS DataBase Reference) |
NIST Chemistry Reference | B(OH)3(10043-35-3) |
EPA Substance Registry System | Orthoboric acid (10043-35-3) |
Absorption | ≤0.05 at 260 in H2O at 1M |
Safety Information |
Hazard Codes | Xi,T,Xn |
Risk Statements | 36/37/38-60-63-62-61 |
Safety Statements | 26-36-53-45-37/39-36/37/39-22-24/25-23 |
WGK Germany | 2 |
RTECS | ED4550000 |
F | 3 |
TSCA | TSCA listed |
HS Code | 28100090 |
Storage Class | 6.1C - Combustible acute toxic Cat.3 |
Hazard Classifications | Repr. 1B |
Hazardous Substances Data | 10043-35-3(Hazardous Substances Data) |
Toxicity | LD50 orally in rats: 5.14 g/kg (Smyth). |
Product Application Of Boric acid CAS#10043-35-3
For weatherproofing wood and fireproofing fabrics; as a preservative; manufacture of cements, crockery, porcelain, enamels, glass, borates, leather, carpets, hats, soaps, artificial gems; in nickeling baths; cosmetics; printing and dyeing, painting; photography; for impregnating wicks; electric condensers; hardening steel. Also used as insecticide for cockroaches and black carpet beetles.
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