Metaborate

Metaborate
	; Monomeric metaborate ion
	; Trimeric metaborate ion
Names
	IUPAC name Metaborate
Identifiers
CAS Number	14100-65-3;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30173;
ChemSpider	2283207;
Gmelin Reference	1047
	InChI InChI=1S/BO2/c2-1-3/q-1 Key: VDLZIANVOYDKFH-UHFFFAOYSA-N;
	SMILES B(=O)[O-];
Properties
Chemical formula	BO−2
Molar mass	42.81 g·mol−1
Related compounds
Related compounds	Borate; Boric acid; Orthoborate; Tetraborate; Tetrahydroxyborate;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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".

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