|Molar mass||238.10 g/mol|
(Loose bulk density: 1.12 g/cm3)
|Melting point||180 °C (356 °F; 453 K) decomposes|
|55.6 g/100 ml (20 °C)|
|EU Index||Not listed|
|R-phrases||R8 R20 R22 R36 R37 R38|
|S-phrases||S17 S26 S36|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
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:
- 2 NaHSO4 → Na2S2O8 + H2
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.
The salt is an oxidizer and forms combustable mixtures with organic materials such as paper.
- FMC Corporation. Sodium Persulfate. http://www.fmcchemicals.com/Portals/chem/Content/docs/Tech%20Data%20Sheets/sodpersulfate.pdf (accessed Nov 17, 2013).
- Pietzsch, A.; Adolph, G. J. Chem. Technol. Biotechnol. 1911, 30, 85.
- Harald Jakob, Stefan Leininger, Thomas Lehmann, Sylvia Jacobi, Sven Gutewort (2005), "Peroxo Compounds, Inorganic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a19_177.pub2
- Block, Philip A., Richard A. Brown, and David Robinson. "Novel activation technologies for sodium persulfate in situ chemical oxidation." Proceedings of the Fourth International Conference on the remediation of chlorinated and recalcitrant compounds. 2004.
- Luchtefeld, Ron; Dasari, Mina S.; Richards, Kristy M.; Alt, Mikaela L.; Crawford, Clark F. P.; Schleiden, Amanda; Ingram, Jai; Hamidou, Abdel Aziz Amadou et al. (2008). "Synthesis of Diapocynin". J. Chem. Ed. 85 (3): 411. doi:10.1021/ed085p411.