Orthoboric acid CAS#10043-35-3
Boric acid (orthoboric acid) is a weakly acidic hydrate of boric oxide with mild antiseptic, antifungal, and antiviral properties.
Boric acid can be used to treat yeast infections and acne, for eyewash by treating any bacterial infection and soothing inflamed eyes, and as a cleanser, deodorizer, stain remover, disinfectant and mold killer. Boric acid can be used as a pesticide to control a variety of pests, as a fungicide for citrus, and as an herbicide along rights-of-way. Boric acid can be used for the manufacture of textile fiberglass, household glass products and the glass used in LCD displays, to reinforce plastics in various products (boats, computer circuit boards and pipes), as a flame retardant, and as a pH buffer agent in plating.
Boric acid is a white, amorphous powder orcolorless, crystalline solid. Molecular weight=61.84;Boiling point=300℃ (decomposes: loses 1/2 its H2O);Freezing/Melting point=170.9℃ (decomposes above100℃). Saturated solutions: at 0℃, 2.6% acid; at 100℃,28% acid. Hazard Identification (based on NFPA-704 MRating System): Health 2, Flammability 0, Reactivity 1.Boric acid is soluble in water; solubility=4.7 g/100 mL at20℃.
| Orthoboric acid Chemical Properties |
| Melting point |
160 °C (dec.) (lit.) |
| Boiling point |
219-220 °C (9.7513 mmHg) |
| density |
1.440 g/cm3 |
| vapor pressure |
2.6 mm Hg ( 20 °C) |
| storage temp. |
Store at +5°C to +30°C. |
| solubility |
H2O: soluble |
| form |
working solution |
| pka |
8.91±0.43(Predicted) |
| Specific Gravity |
1.435 |
| color |
≤10(APHA) |
| PH |
3.6-4.4 (25℃, saturated solution in H2O) |
| Odor |
Odorless |
| PH Range |
3.8 – 4.8 |
| Water Solubility |
49.5 g/L (20 ºC) |
| Sensitive |
Hygroscopic |
| λmax |
λ: 260 nm Amax: 0.05
λ: 280 nm Amax: 0.05 |
| Merck |
14,1336 |
| BRN |
1697939 |
| Exposure limits |
ACGIH: TWA 2 mg/m3; STEL 6 mg/m3 |
| InChIKey |
KGBXLFKZBHKPEV-UHFFFAOYSA-N |
| 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) |
| 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 |
Yes |
| HS Code |
28100090 |
| Hazardous Substances Data |
10043-35-3(Hazardous Substances Data) |
| Toxicity |
LD50 orally in rats: 5.14 g/kg (Smyth). |
