Sodium metaborate

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Sodium metaborate
Sodium metaborate structure.svg
  • 98536-58-4 ☑Y
3D model (JSmol)
  • Interactive image
EC Number 231-891-6
PubChem CID
  • 145326
RTECS number ED4640000
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)
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
65.94 J/mol K
73.39 J/mol K
-1059 kJ/mol
Lethal dose or concentration (LD, LC):
LD50 (median dose)
2330 mg/kg (rat, oral)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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


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.

Reaction as follows:



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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