Orthoboric acid CAS#10043-35-3

Products Description of Orthoboric acid CAS#10043-35-3

Boric acid is a crystalline compound formed by boron trioxide dissolving in water. It is an inorganic acid, mainly tetraboric acid H2B4O7 (also known as pyroboric acid), metaboric acid (HBO2)n and orthoboric acid H3BO3 (also known as orthoboric acid). Among them, orthoboric acid has the highest water content and is the most stable. Orthoboric acid, also known as boric acid for short, appears as white powdery crystals or flaky crystals with three oblique axes, and is shiny. It has a slight bitter taste. It feels greasy when in contact with the skin. It has no odor and is soluble in water, ethanol, glycerin, ethers and essential oils. The aqueous solution is weakly acidic. When orthoboric acid is heated to 70-100℃, it gradually dehydrates to metaboric acid, pyroboric acid at 150℃-160℃, and boric anhydride (B2O3) at 300℃. Boric acid is toxic to the human body. Solubility in water: 2.77 at 0℃, 3.65 at 10℃, 4.87 at 20℃, 5.74 at 25℃, 6.77 at 30℃, 8.90 at 40℃, 11.39 at 50℃, 14.89 at 60℃, 23.54 at 80℃, 38.00 at 100℃. The aqueous solution is weakly acidic and is a typical Lewis acid. The presence of hydrochloric acid, citric acid or tartaric acid can promote its solubility in water. Therefore, it can be purified by recrystallization.

Parameters

Melting point	160 °C (dec.) (lit.)
Boiling point	219-220 °C (9.7513 mmHg)
density	1.440 g/cm3
bulk density	400-600kg/m3
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
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)
Absorption	≤0.05 at 260 in H2O at 1M ≤0.05 at 280 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	Yes
HS Code	28100090
Hazardous Substances Data	10043-35-3(Hazardous Substances Data)
Toxicity	LD50 orally in rats: 5.14 g/kg (Smyth).

Product Application of  Orthoboric acid CAS#10043-35-3

Boric acid can be used to study molecular biology, DNA and RNA purification, biological buffers and molecular biology reagents. Boric acid has been used to test the toxic effects of boron on growth and antioxidant system parameters of maize (Zea mays L.) roots. Boric acid has also been used to study the effect of time period after boric acid injection on (10)B absorption in different regions of adult male rat′s brain.

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