Chemical Properties of Potassium Persulfate

Potassium persulfate is an inorganic compound belonging to the persulfate family. Here are its key physical and chemical characteristics:

  • Molecular Formula: K₂S₂O₈
  • Molecular Weight: 270.32 g/mol
  • Appearance: White to off-white crystalline powder
  • Melting Point: Decomposes above 100°C (does not melt)
  • Solubility: Highly soluble in water (approximately 5.3 g/100 mL at 20°C), moderately soluble in methanol, and insoluble in alcohol
  • pH of Aqueous Solution: Acidic (around 2-3 for a 1% solution)
  • Density: 2.477 g/cm³
  • Oxidizing Strength: It releases oxygen upon decomposition, making it an effective initiator for radical reactions

This compound decomposes in the presence of heat, moisture, or reducing agents, producing sulfate ions and oxygen. It is stable when stored dry and away from contaminants.

                                               ANALYSIS  RESULT
ITEM STANDARD TEST RESULT
Appearance  white crystalline powder
K2S2O8 % ≥ 99.0 99.39
Fe % ≤ 0.001 0.0005
Chloride (as Cl) % ≤ 0.005 0.006
Ammonium salt ( as NH4）% ≤ 0.2 0.14
Heavy Metal (as Pb) % ≤ 0.001 0.0008
Moisture % ≤ 0.05 0.05
Mn % ≤ 0.0001 0.00008
Conclusion: comply standard GB/T26519.2-2021

Safety and Handling Guidelines

While effective, it requires careful handling due to its oxidative nature:

  • Hazards: Strong oxidizer; may cause fire or explosion in contact with combustibles. Skin and eye irritant; inhalation can lead to respiratory issues.
  • Storage: Keep in a cool, dry, well-ventilated area in airtight containers. Avoid contact with metals, organics, or reducing agents.
  • Personal Protective Equipment (PPE): Wear gloves, safety goggles, and respiratory protection during use.
  • First Aid: Rinse affected areas with water for 15 minutes; seek medical attention for ingestion or inhalation.
  • Environmental Impact: Dispose of as hazardous waste; neutralize with reducing agents before release.

Always consult material safety data sheets (MSDS) for specific protocols.

Frequently Asked Questions (FAQs)

What is the difference between potassium persulfate and sodium persulfate?

Potassium persulfate (K₂S₂O₈) and sodium persulfate (Na₂S₂O₈) are similar in oxidizing power, but potassium persulfate offers better solubility in certain solvents and is preferred in polymerization due to lower hygroscopicity.

Is potassium persulfate safe for skin contact?

No, it can cause irritation or burns. Always use protective gear and dilute solutions appropriately for any topical applications, such as hair bleaching.

How should potassium persulfate be stored to maintain potency?

Store in a sealed, non-metallic container at temperatures below 30°C, away from light and moisture. Shelf life is typically 1-2 years under ideal conditions.

Can potassium persulfate be used in food processing?

It is not approved for direct food contact but may appear in indirect applications like packaging production. Verify regulatory compliance for specific uses.

What are the signs of potassium persulfate decomposition?

Yellowing of the powder, evolution of gas, or heat generation indicate decomposition. Discard if observed.

Is potassium persulfate environmentally friendly?

It aids in eco-friendly water treatment but must be handled to prevent release into waterways, where it can harm aquatic life.

For more detailed inquiries, refer to the sections above or contact our experts.

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