Trisodium pentaborate is a
salt
In common usage, salt is a mineral composed primarily of sodium chloride (NaCl). When used in food, especially in granulated form, it is more formally called table salt. In the form of a natural crystalline mineral, salt is also known as r ...
that can form as a
monohydrate
In chemistry, a hydrate is a substance that contains water or its constituent elements. The chemical state of the water varies widely between different classes of hydrates, some of which were so labeled before their chemical structure was understo ...
with formula , which contains the
anion
An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by conven ...
dihydroxydopentaborate .
[
Its formula may be incorrectly given as , or as . It may also be called simply ]sodium pentaborate
Sodium pentaborate, more properly disodium decaborate, is a chemical compound of sodium, boron, and oxygen; a salt with elemental formula , , or . It is a colorless crystalline solid, soluble in water.
The compound is often encountered or traded ...
,[ but this name is more properly reserved for the compound with elemental formula .
]
Structure
Trisodium pentaborate monohydrate crystallizes as thin plates in the orthorhombic crystal system
In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with ...
, with symmetry group
In group theory, the symmetry group of a geometric object is the group of all transformations under which the object is invariant, endowed with the group operation of composition. Such a transformation is an invertible mapping of the amb ...
''Pbca'' and cell parameters ''a'' = 880.4 pm, ''b'' = 1837.1 pm, ''c'' = 1092.4 pm, formulas per cell ''Z'' = 8.[
]
References
[Silvio Menchetti and Cesare Sabelli (1977): "The crystal structure of synthetic sodium pentaborate monohydrate". ''Acta Crystallographica Section B'', volume B33, pages 3730-3733. ]
sodium compounds
borates
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