Sodium perborate

Sodium perborate

Names
Other names PBS-1 (mono), PBS-4 (tetra)
Identifiers
CAS Number	7632-04-4 Y 10332-33-9 (monohydrate) Y 10486-00-7 (tetrahydrate) Y
3D model (Jmol)	Interactive image
ChEBI	CHEBI:30178 Y
ChemSpider	4574023 Y
ECHA InfoCard	100.106.721
EC Number	231-556-4
PubChem CID	5460514
RTECS number	SC7350000
UNII	Y52BK1W96C Y
UN number	1479
InChI InChI=1S/B2H4O8.2Na/c3-1(4)7-9-2(5,6)10-8-1;;/h3-6H;;/q-2;2*+1 Y Key: JBUKJLNBQDQXLI-UHFFFAOYSA-N Y InChI=1/B2H4O8.2Na/c3-1(4)7-9-2(5,6)10-8-1;;/h3-6H;;/q-2;2*+1 Key: JBUKJLNBQDQXLI-UHFFFAOYAG
SMILES [Na+].[Na+].O[B-]1(OO[B-](O)(O)OO1)O
Properties
Chemical formula	NaBO3·nH2O
Molar mass	99.815 g/mol (monohydrate); 153.86 g/mol (tetrahydrate)
Appearance	white powder
Odor	odorless
Melting point	63 °C (145 °F; 336 K) (tetrahydrate)
Boiling point	130 to 150 °C (266 to 302 °F; 403 to 423 K) (tetrahydrate, decomposes)
Solubility in water	2.15 g/100 mL (tetrahydrate, 18 °C)
Pharmacology
ATC code	A01AB19 (WHO)
Hazards
Safety data sheet	ICSC 1046
NFPA 704	1 1 0
Flash point	non-flammable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

Sodium perborate (PBS) is a white, odorless, water-soluble chemical compound with the chemical formula Na₂B₂O₄(OH)₄. It is usually encountered as the tetrahydrate, but monohydrate, NaBO₃·H₂O and trihydrates are well known NaBO₃·3H₂O and The monohydrate and tetrahydrate are the commercially important forms. This salt is widely used in laundry detergents.

Sodium perborate is manufactured by reaction of disodium tetraborate pentahydrate, hydrogen peroxide, and sodium hydroxide. The monohydrate form dissolves better than the tetrahydrate and has higher heat stability; it is prepared by heating the tetrahydrate. Sodium perborate undergoes hydrolysis in contact with water, producing hydrogen peroxide and borate.

The salt is a reagent in organic synthesis. It converts thioethers into sulfoxides and sulfones for example.

Unlike sodium percarbonate and perphosphate, the sodium perborate is not simply an adduct with hydrogen peroxide. Rather, it adopts a cyclic structure with a B₂O₄ core and four hydroxide groups attached to the two boron atoms. The ring has a chair-shaped 6-membered ring.

It serves as a source of active oxygen in many detergents, laundry detergents, cleaning products, and laundry bleaches. It is also present in some tooth bleaching formulas. It is used as a bleaching agent for internal bleaching of a non vital root treated tooth. The sodium perborate is placed inside the tooth and left in place for an extended period of time to allow it to diffuse into the tooth and bleach stains from the inside out. It has antiseptic properties and can act as a disinfectant. It is also used as a "disappearing" preservative in some brands of eye drops.