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What is Sodium Persulfate?

Views: 1     Author: Site Editor     Publish Time: 2023-04-23      Origin: Site

Sodium Persulfate, also known as sodium peroxydisulfate, is an inorganic compound with the chemical formula Na2S2O8. It is a white crystalline solid that is highly soluble in water. Sodium Persulfate is a powerful oxidizing agent that is used in various industrial and laboratory applications.


Chemical Properties of Sodium Persulfate

Sodium Persulfate is an oxidizing agent that can release oxygen when heated or dissolved in water. It has a molar mass of 238.13 g/mol and a melting point of 100 °C. Sodium persulfate is soluble in water, but insoluble in organic solvents such as ethanol and acetone. It is a strong oxidizing agent that can oxidize a wide range of compounds, including metals, sulfides, and organic compounds.


Physical Properties of Sodium Persulfate

Sodium Persulfate is a white crystalline solid that has a density of 2.5 g/cm³. It is highly soluble in water, with a solubility of 554 g/L at 20 °C. The pH of a 1% aqueous solution of sodium Persulfate is around 2. Sodium persulfate has a relatively low vapor pressure and does not release toxic fumes.


Production of Sodium Persulfate

Sodium Persulfate is produced by electrolyzing a solution of sodium sulfate in the presence of a persulfate salt. The process involves the following steps:

  1. Dissolving sodium sulfate in water to form a solution.

  2. Adding a persulfate salt to the solution, such as Ammonium Persulfate or Potassium Persulfate.

  3. Electrolyzing the solution using a direct current, which causes the persulfate salt to decompose and form Sodium Persulfate.

The overall reaction can be represented as follows:

2Na2SO4 + 2H2O → 2NaHSO4 + H2 + O2  2NaHSO4 + (NH4)2S2O8 → Na2S2O8 + 2NH4HSO4


Applications of Sodium Persulfate

Sodium Persulfate is a versatile oxidizing agent that finds use in various industrial and laboratory applications. Some of the most common applications are:


Polymerization Initiator

Sodium Persulfate is widely used as a polymerization initiator in the production of various polymers, such as polyacrylamide, polyvinyl chloride, and polystyrene. It initiates the polymerization reaction by releasing free radicals that react with the monomer molecules to form long polymer chains.


Etchant and Cleaner

Sodium Persulfate is an effective etchant and cleaner for various metals, such as copper, brass, and aluminum. It can dissolve metal oxides and sulfides and remove surface contamination, such as solder flux residues.


Other Applications

Sodium Persulfate also finds use in other applications, such as:

  • Textile and paper processing: It is used as a bleaching agent for textiles and paper products.

  • Soil remediation: It can be used to oxidize and remove organic contaminants from soil and groundwater.

  • Laboratory applications: It is used as a reagent for chemical analysis and synthesis in various laboratory applications.


Safety Precautions While Handling Sodium Persulfate

Sodium Persulfate is a strong oxidizing agent that can pose health and safety hazards if not handled properly. Here are some safety precautions to keep in mind while handling Sodium Persulfate:

  • Wear appropriate personal protective equipment, such as gloves, goggles, and a lab coat.

  • Avoid inhalation of dust or mist, as it can cause respiratory irritation.

  • Avoid skin and eye contact, as it can cause severe irritation and burns.

  • Store sodium persulfate in a cool, dry, and well-ventilated area, away from incompatible materials, such as reducing agents and flammable liquids.

  • Follow proper handling, storage, and disposal procedures, as per local regulations.



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Qi Di Chem was established in 2003, is specialized in manufacturing persulfate series products (Ammonium Persulfate, Sodium Persulfate, Potassium Persulfate).

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