Sodium metaborate

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Sodium metaborate
Sodium metaborate structure.svg
Identifiers
CAS number 98536-58-4 YesY
PubChem 145326
EC number 231-891-6
RTECS number ED4640000
Jmol-3D images Image 1
Properties
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
Structure
Crystal structure trigonal
Thermochemistry
Specific
heat capacity
C
65.94 J/mol K
Std molar
entropy
So298
73.39 J/mol K
Std enthalpy of
formation
ΔfHo298
-1059 kJ/mol
Hazards
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)
Infobox references

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

Preparation[edit]

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.

Uses[edit]

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

See also[edit]

References[edit]