 Monomeric metaborate ion
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 Trimeric metaborate ion
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| Names | |
|---|---|
| IUPAC name
Metaborate
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| Identifiers | |
3D model (JSmol)
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| ChEBI | |
| ChemSpider | |
| 1047 | |
CompTox Dashboard (EPA)
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| Properties | |
| BO−2 | |
| Molar mass | 42.81 g·mol−1 |
| Related compounds | |
Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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A metaborate is a borate anion consisting of boron and oxygen, with empirical formula BO−2. Metaborate also refers to any salt or ester of such anion (e.g. salts such as sodium metaborate NaBO2 or calcium metaborate Ca(BO2)2, and esters such as methyl metaborate CH3BO2). Metaborate is one of the boron's oxyanions. Metaborates can be monomeric, oligomeric or polymeric.
In aqueous solutions metaborate anion hydrolyzes to tetrahydroxyborate [B(OH)4]−. For this reason, solutions or hydrated salts of the latter are often improperly named "metaborates".