Sodium persulfate

Sodium persulfate

Names
Other names Sodium peroxodisulfate Sodium peroxodisulphate Sodium peroxydisulfate Sodium peroxydisulphate
Identifiers
CAS Number	7775-27-1 Y
3D model (Jmol)	Interactive image
ChEMBL	ChEMBL502764 Y
ChemSpider	56406 Y
ECHA InfoCard	100.028.993
EC Number	231-892-1
PubChem	62655
RTECS number	SE0525000
UN number	1505
InChI InChI=1S/2Na.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2 Y Key: CHQMHPLRPQMAMX-UHFFFAOYSA-L Y InChI=1/2Na.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2 Key: CHQMHPLRPQMAMX-NUQVWONBAA
SMILES [Na+].[Na+].O=S(=O)([O-])OOS([O-])(=O)=O
Properties
Chemical formula	Na2S2O8
Molar mass	238.10 g/mol
Appearance	white powder
Density	2.59 g/cm3 (Loose bulk density: 1.12 g/cm3)
Melting point	180 °C (356 °F; 453 K) decomposes
Solubility in water	55.6 g/100 ml (20 °C)
Hazards
Safety data sheet	ICSC 1136
R-phrases	R8 R20 R22 R36 R37 R38
S-phrases	S17 S26 S36
NFPA 704	0 2 1 OX
Flash point	Non-flammable
Related compounds
Other anions	Sodium dithionite Sodium sulfite Sodium sulfate
Other cations	Potassium persulfate
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 persulfate is the inorganic compound with the formula Na₂S₂O₈. It is the sodium salt of persulfate (also called peroxydisulfate), an oxidizer. It is a white solid that dissolves in water. It is almost non-hygroscopic and has good shelf-life.

The salt is prepared by the electrolytic oxidation of sodium hydrogen sulfate:

Oxidation is conducted at a platinum anode. In this way about 165,000 tons were produced in 2005.

The standard redox potential of sodium persulfate into hydrogen sulfate is 2.1 V, which is higher than that of hydrogen peroxide (1.8 V) but lower than ozone (2.2 V). The sulfate radical formed in situ has a standard electrode potential of 2.7 V.

It is mainly used as a radical initiator for emulsion polymerization reactions for styrene based polymers such as Acrylonitrile butadiene styrene. Also applicable for accelerated curing of low formaldehyde adhesives.

It is a bleach, both standalone (particularly in hair cosmetics) and as a detergent component. It is a replacement for ammonium persulfate in etching mixtures for zinc and printed circuit boards, and is used for pickling of copper and some other metals.

It is also used as a soil conditioner and soil remediation and in manufacture of dyestuffs, modification of starch, bleach activator, desizing agent for oxidative desizing, etc.