Sodium metaborate
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Sodium metaborate is a chemical compound of sodium, boron, and oxygen with formula NaBO2.[3] However, the metaborate ion is trimeric in the anhydrous solid, therefore a more correct formula is Na3B3O6 or (Na+)3[B3O6]3−. The formula can be written also as Na2O·B2O3 to highlight the relation to the main oxides of sodium and boron.[2] The name is also applied to several hydrates whose formulas can be written NaBO2·nH2O for various values of n.
Quick Facts Names, Identifiers ...
Sodium metaborate monomer | |
Sodium metaborate trimer | |
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IUPAC name
Sodium metaborate | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ECHA InfoCard | 100.028.992 |
EC Number |
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RTECS number |
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CompTox Dashboard (EPA) |
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Properties | |
NaBO2 | |
Molar mass | 65.80 g·mol−1 |
Appearance | Colorless crystals |
Odor | Odorless |
Density | 2.464 g/cm3 (anhydrous)[1] |
Melting point | 966 °C (1,771 °F; 1,239 K) |
Boiling point | 1,434[2] °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 |
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).
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The anhydrous and hydrates are colorless crystalline solids. The anhydrous form is hygroscopic.[4]