Trisodium pentaborate

Trisodium pentaborate
Identifiers
3D model (JSmol)	Interactive image;
	InChI InChI=1S/B5H4O10.3Na.H2O/c6-2-10-1-11-5(13-2)14-3(7)12-4(8,9)15-5;;;;/h8-9H,1H2;;;;1H2/q-2;;;; Key: GCZJYHCEEQCBQM-UHFFFAOYSA-N;
	SMILES [Na].[Na].[Na].O1B([O-])O[B+](O)(O)OB12OB([O-])O[B-]O2.O;
Properties
Chemical formula	B5H2Na3O10
Molar mass	285.03 g·mol−1
Appearance	Transparent crystal
Solubility in water	Soluble
Structure
Crystal structure	Orthorhombic
Related compounds
Related compounds	probertite, heidornite, garrelsite
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Trisodium pentaborate is a salt that can form as a monohydrate with formula Na₃B₅O₈(OH)₂·H₂O, which contains the anion dihydroxydopentaborate [B₅O₈(OH)₂]³⁻.^[1]

Its formula may be incorrectly given as Na₃B₅O₈·2H₂O, or as 3Na₂O₅B₂O₃·4H₂O. It may also be called simply sodium pentaborate,^[1] but this name is more properly reserved for the compound with elemental formula Na₂O·5B₂O₃·nH₂O.

Structure

Trisodium pentaborate monohydrate crystallizes as thin plates in the orthorhombic crystal system, with symmetry group Pbca and cell parameters a = 880.4 pm, b = 1837.1 pm, c = 1092.4 pm, formulas per cell Z = 8.^[1]

References

^ ^a ^b ^c Silvio Menchetti and Cesare Sabelli (1977): "The crystal structure of synthetic sodium pentaborate monohydrate". Acta Crystallographica Section B, volume B33, pages 3730-3733. doi:10.1107/S0567740877011959

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[menc1977-1] Silvio Menchetti and Cesare Sabelli (1977): "The crystal structure of synthetic sodium pentaborate monohydrate". Acta Crystallographica Section B, volume B33, pages 3730-3733. doi:10.1107/S0567740877011959

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