Description
DryPowder; PelletsLargeCrystals;WHITE CRYSTALS OR CRYSTALLINE POWDER.;White, odorless, crystalline solid.;White, odorless, crystalline solid. [herbicide] [Note: Becomes anhydrous at 608°F.]
Synonyms
SODIUM TETRABORATE 10H₂O;SODIUM TETRABORATE-10-HYDRATE;SODIUM TETRABORATE DECAHYDRATE;SODIUM TETRABORATE, DODECAHYDRATE;SODIUM TETRABORATE HYDRATED;SODIUM(DI-) TETRABORATE, DECAHYDRATE;SODIUM BORATE;SODIUM BORATE, 10-HYDRATE
IUPAC Name
disodium; 3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5, 7-tetraborabicyclo [3.3.1]nonane; decahydrate
Molecular Weight
381.37
Molecular Formula
H20Na2B4O17
InChI
InChI=1S/B4O7.2Na.10H₂O/c5-1-7-3-9-2(6)10-4(8-1)11-3;;;;;;;;;;;;/h;;;10*1H2/q-2;2*+1;;;;;;;;;;
InChI Key
CDMADVZSLOHIFP-UHFFFAOYSA-N
Boiling Point
608°F;608°F
Melting Point
75 °C (decomposes);167°F;167°F
Density
1.73 g/cu cm;Relative density (water = 1): 1.7;1.73;1.73
Solubility
In water, 5.93X10+4 mg/L at 25 °C;3.17 g/100 g water at 25 °C;1 g/16 mL in water; 1 g/0.6 mL boiling water; 1 g/1 mL glycerol; insoluble in alcohol;Insoluble in ethanol;0.60 g/100 g acetone;Solubility in water, g/100ml at 20 °C: 5.1;6%
Color Form
White, monoclinic crystals;Hard crystals, granules or crystalline powder; efflorescent in dry air, the crystals often being coated with white powder;Crystalline granules or crystalline powder;White, crystalline solid [Note: Becomes anhydrous at 608 degrees F]
Complexity
121
Corrosivity
Solutions are not a corrosion hazard to ferrous metals.
Covalently-Bonded Unit Count
13
Decomposition
When heated to decomposition it emits toxic fumes of /sodium oxide and boron/.
EC Number
215-540-4
Exact Mass
382.0868
Formal Charge
0
H-Bond Acceptor
17
H-Bond Donor
10
Heavy Atom Count
23
ICSC Number
0567
MDL Number
MFCD00149193
MeSH Entry Terms
disodium borate, heptahydrate;disodium borate, monohydrate;Komex;monosodium metaborate;sodium borate;sodium borate (NaBO2);sodium diborate;sodium meta borate;sodium metaborate;sodium tetraborate
Monoisotopic Mass
382.0868
Odor
Odorless
Other Experimental
Aqueous solution is alkaline to litmus and phenolphthalein; pH about pH = 9.5;At 100 °C loses 5H₂O; at 150 °C loses 9H₂O; becomes anhydrous at 320 °C; borax dissolves many metallic oxides when fused with them;A 2.6% solution is iso-osmotic with serum;Moh's hardness: 2.3;Loses water of crystallization when heated, with melting, between 75 °C and 320 °C; fuses to a glassy mass at red heat (borax glass); effloresces slightly in warm, dry air;Degree of hydration: 36.5% B2O3;Stable
Physical State
White powder or crystals
Refractive Index
Index of refraction: 1.447 (alpha); 1.469 (beta); 1.472 (gamma)
Rotatable Bond Count
0
RTECS Number
VZ2275000
Stability
Stable. When heated above about 62 °C, borax loses water of crystallization, first forming the pentahydrate and then anhydrous sodium tetraborate.
Symbol
GHS08
UNII
91MBZ8H3QO
Vapor Pressure
Approximately 0 mm Hg;0 mmHg (approx);0 mmHg (approx)
