Sodium metaborate

Sodium metaborate

Identifiers
CAS Number	98536-58-4 Y
EC Number	231-891-6
Jmol 3D model	Interactive image
PubChem	145326
RTECS number	ED4640000
InChI InChI=1S/BO2.Na/c2-1-3;/q-1;+1 Key: NVIFVTYDZMXWGX-UHFFFAOYSA-N
SMILES B(=O)[O-].[Na+]
Properties
Chemical 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
Vapor pressure	{{{value}}}
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.

Preparation

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

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

See also

• Borate