Sodium metaborate

Sodium metaborate
Identifiers
CAS Number	98536-58-4 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.028.992
EC Number	231-891-6;
PubChem CID	145326;
RTECS number	ED4640000;
CompTox Dashboard (EPA)	DTXSID2034386 ;
	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
Heat capacity (C)	65.94 J/mol K
Std molar; entropy (S⦵298)	73.39 J/mol K
Std enthalpy of; formation (ΔfH⦵298)	-1059 kJ/mol
Hazards
	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]

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.

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

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