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Sodium metaborate

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Title: Sodium metaborate  
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Subject: Sodium nitride, Sodium zincate, Sodium permanganate, Sodium bismuthate, Sodium hypophosphite
Collection: Borates, Sodium Compounds
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Sodium metaborate

Sodium metaborate
CAS number  YesY
EC number
RTECS number ED4640000
Jmol-3D images Image 1
Molecular formula NaBO2
Molar mass 65.80 g/mol
Appearance colorless crystals
Odor odorless
Density 2.46 g/cm3
Melting point 966 °C (1,771 °F; 1,239 K)
Boiling point 1,434 °C (2,613 °F; 1,707 K)
Solubility in water 16.4 g/100 mL (0 °C)
28.2 g/100 mL (25 °C)
125.2 g/100 mL (100 °C)
Solubility insoluble in ether, ethanol
Crystal structure trigonal
heat capacity
65.94 J/mol K
Std molar
73.39 J/mol K
Std enthalpy of
-1059 kJ/mol
LD50 2330 mg/kg (rat, oral)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)

Sodium metaborate (NaBO2) is a colorless solid chemical compound. [1]


  • Preparation 1
  • Uses 2
  • See also 3
  • References 4


Sodium metaborate is prepared by the fusion of sodium carbonate and borax. Another way to create the compound is by the fusion of sodium tetraborate with sodium hydroxide at 700° C.


Sodium metaborate is used in the manufacturing of borosilicate glasses. It is also a component of herbicides and antifreeze.

See also


  1. ^ Sodium metaborate at Chemister
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