Tetrahydroxyborate

Tetrahydroxyborate
IUPAC name

Tetrahydroxyborate
Systematic name

Tetrahydroxyboranuide[1] (substitutive)
Tetrahydroxidoborate(1-)[1] (additive)
Identifiers
CAS number 15390-83-7
PubChem 177595
ChemSpider 154612 Y
ChEBI CHEBI:41132
ChEMBL CHEMBL1231419 Y
Gmelin Reference 1966
Jmol-3D images Image 1
Properties
Molecular formula H4BO4-
Molar mass 78.840 g mol-1
Exact mass 79.020264082 g mol-1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Tetrahydroxyborate, [H4BO4]− or B(OH)−
4, is a boron oxoanion with a tetrahedral geometry.[2] It is isoelectronic with the hypothetical compound orthocarbonic acid.

B(OH)−
4 is formed by the addition of hydroxide, OH−, to boric acid, B(OH)3:

B(OH)3 + OH− B(OH)−
4

Though it is still represented as simple hydrolysis,[3] the formation of tetrahydroxyborate in aqueous solution is responsible for the acidity of boric acid:[2]

B(OH)3 + H2O B(OH)−
4 + H+
pK = 9.25[2]

The tetrahydroxyborate anion is found in Na[B(OH)4],[4] Na2[B(OH)4]Cl and CuII[B(OH)4]Cl.

ball-and-stick model of the crystal
structure of sodium tetrahydroxyborate
space-filling model of the crystal
structure of sodium tetrahydroxyborate

See also

References

  1. ^ a b "Tetrahydroxoborate(1-) (CHEBI:41132)". Chemical Entities of Biological Interest (ChEBI). UK: European Bioinformatics Institute. https://www.ebi.ac.uk/chebi/searchId.do?chebiId=41132. 
  2. ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. p. 203–205. ISBN 0080379419. 
  3. ^ Goldberg, R.; Kishore, N.; Lennen, R. (2002). "Thermodynamic Quantities for the Ionization Reactions of Buffers". J. Phys. Chem. Ref. Data 31 (2): 231–370. doi:10.1063/1.1416902. http://www.nist.gov/data/PDFfiles/jpcrd615.pdf. 
  4. ^ L. J. Csetenyi, F. P. Glasser, R. A. Howie (June 1993). "Structure of sodium tetrahydroxyborate". Acta Cryst. C49 (6): 1039–1041. doi:10.1107/S0108270193000058.