Catalog Number
ACMA00014303
Description
Boric acid is an odorless white solid. Melting point 171°C. Sinks and mixes with water. (USCG, 1999);DryPowder; Liquid; OtherSolid; OtherSolid, Liquid; PelletsLargeCrystals;PelletsLargeCrystals;Colourless, odourless, transparent crystals or white granules or powder; slightly unctuous to the touch; occurs in nature as the mineral sassolite;Solid;ODOURLESS COLOURLESS CRYSTALS OR WHITE POWDER.;Odorless white solid.
Molecular Weight
61.84g/mol
Molecular Formula
H3BO3;BH3O3;B(OH)3;H3BO3;B(OH)3;BH3O3
InChI
InChI=1S/BH3O3/c2-1(3)4/h2-4H
InChI Key
KGBXLFKZBHKPEV-UHFFFAOYSA-N
Boiling Point
572 °F at 760 mm Hg (decomposes) (NTP, 1992);572°F
Melting Point
340 °F (NTP, 1992);170.9 °C;171°C;340°F
Density
1.435 at 68 °F (USCG, 1999);1.5 g/cu cm;Relative density (water = 1): 1.5;1.435
Solubility
10 to 50 mg/mL at 66° F (NTP, 1992);Soluble in hot water, partially soluble in cold water;Solubility: in glycerol 17.5% at 25 °C; ethylene glycol 18.5% at 25 °C; in methanol 173.9 g/L at 25 °C; in ethanol 94.4 g/L at 25 °C; in acetone 0.6% at 25 °C; ethyl acetate 1.5% at 25 °C;Water solubility: 2.52% at 0 °C; 3.49% at 10 °C; 4.72% at 20 °C; 6.23% at 30 °C; 8.08% at 40 °C; 10.27% at 50 °C; 12.97% at 60 °C; 15.75% at 70 °C; 19.10% at 80 °C; 23.27% at 90 °C; 27.53% at 100 °C;Solubility in water is increased by hydrochloric acid;In water, 5.0X10+4 mg/L at 25 °C;50 mg/mL at 25 °C;Solubility in water, g/100ml at 20 °C: 5.6
Color/Form
Colorless, transparent crystals or white granules or powder;Colorless triclinic crystals;White waxy triclinic solid plates
Covalently-Bonded Unit Count
1
EC Number
233-139-2;233-139-2;234-343-4
Log P
log Kow = 0.175;0.18;-1.09
MeSH Entry Terms
boric acid;boron oxide hydroxide;orthoboric acid
Monoisotopic Mass
62.017524g/mol
Other Experimental
Slightly unctuous to touch; volatile with steam; solubility in water increased by hydrochloric, citric or tartaric acids;Loses 1.5H₂O at 300 °C;Standard enthalpy of formation: -1094.3 kJ/mol (crystal); -994.1 kJ/mol (gas);pH at 20 °C: 6.1 (0.1% solution); 5.1 (1.0% solution); 3.7 (4.5% solution);Boric acid will form soluble salts with monovalent cations (e.g. Na2B407.1OH20, 6% in water) and insoluble salts with divalent cations (e.g. CaB407.6H20, almost insoluble in cold water).;Henry's Law constant = 2.6X10-12 atm-cum/mole at 25 °C, based on measured water solubility and vapor pressure;Hydroxyl radical reaction rate constant = 4.2X10-13 cu cm/molecule-sec at 25 °C (est)
Refractive Index
Index of refraction: 1.337, 1.461, 1.462
Stability
Stable in air.;...Stable up to 100 °C
Vapor Pressure
1.6X10-6 mm Hg at 25 °C (2.136X10-4 Pa); log P (in Pa) = 26.83 - 9094/T where T is deg K;Vapor pressure at 20 °C: negligible
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