Sodium pentaborate

Sodium pentaborate, more properly disodium decaborate, is a chemical compound of sodium, boron, and oxygen; a salt with elemental formula NaB5O8, Na2B10O16, or Na2O·5B2O3. It is a colorless crystalline solid, soluble in water.

Not to be confused with Trisodium pentaborate.
Disodium decaborate
Names
Other names
Sodium pentaborate
Identifiers
3D model (JSmol)
ECHA InfoCard 100.031.371
EC Number
  • 234-522-7
UNII
  • InChI=1S/B5O8.Na/c6-1-8-3-11-4-9-2(7)10-5(12-3)13-4;/q-1;+1
    Key: OLBJLOUJSZVXOT-UHFFFAOYSA-N
  • B(=O)OB1OB2OB(OB(O2)O1)[O-].[Na+]
Properties
Na+[B5O6(OH)4]− or Na+[B5O7(OH)2]−·H2O
Molar mass 241.06 g·mol−1
Appearance Colorless crystalline solid
Soluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

The compound is often encountered or traded as hydrates NaB5O8·nH2O, Na2B10O16·2nH2O, or Na2O·5B2O3·2nH2O for n = 2, 4, 5, or other values. This formula is often misleading as some of the water molecules are actually hydroxyl groups covalently attached to boron atoms.

The compound is used in agriculture as a boron supplement in fertilizer with various trade names such as Solubor and Aquabor. It has also been tested as an additive to improve plasma electrolytic oxidation of magnesium alloys.

The name "sodium pentaborate" has also been used for a distinct compound with formula Na3B5O8·nH2O, better called trisodium pentaborate.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.