Sodium persulfate
| Sodium persulfate | |
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Other names
Sodium peroxodisulfate |
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| Identifiers | |
| CAS number | 7775-27-1  |
| PubChem | 62655 |
| ChemSpider | 56406 |
| EC number | 231-892-1 |
| UN number | 1505 |
| ChEMBL | CHEMBL502764 |
| RTECS number | SE0525000 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | Na2S2O8 |
| Molar mass | 238.10 g/mol |
| Appearance | white powder |
| Density | 2.40 g/cm3 |
| Melting point |
180 °C decomp. |
| Solubility in water | 55.6 g/100 ml (20 °C) |
| Hazards | |
| MSDS | ICSC 1136 |
| EU Index | Not listed |
| R-phrases | R8 R20 R22 R36 R37 R38 |
| S-phrases | S17 S26 S36 |
| NFPA 704 |
 0
2
1
OX
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| Flash point | Non-flammable |
| Related compounds | |
| Other anions | Sodium dithionite Sodium sulfite Sodium sulfate |
| Other cations | Potassium persulfate |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Sodium persulfate (Na2S2O8) is a chemical compound. It is a strong oxidizer. It is a severe irritant of the skin, eyes, and respiratory system. It is almost non-hygroscopic and has particularly good ability to be stored for long time. It is easy and safe to handle. It is not combustible, but releases oxygen easily and assists combustion of other materials.
It is used as 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 a source of free radicals, making it useful as a radical initiator for emulsion polymerization reactions and for accelerated curing of low formaldehyde adhesives. It is also used as a soil conditioner and in manufacture of dyestuffs, modification of starch, bleach activator, desizing agent for oxidative desizing, etc.
Conditions/substances to avoid mixing persulfates with are: moisture, heat, flame, ignition sources, shock, friction, reducing agents, organic material, sodium peroxide, water, aluminium, and powdered metals.
Sodium persulfate is an oxidizing agent in chemistry, for example in a synthesis of diapocynin from apocynin where iron(II) sulfate is the radical initiator:[1]
The sulfate radical formed in situ has a standard electrode potential of 2.7 V.
References [edit]
- ^ 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.
