Disodium Phosphate Extra Pure

KEY ATTRIBUTES

1. Basic Identification Attributes

• Chemical Name: Disodium Phosphate 
• Other Names: Sodium phosphate dibasic, Disodium hydrogen phosphate 
• Chemical Formula: Na₂HPO₄ 
• CAS Number: 
  • Anhydrous: 7558-79-4 
  • Dihydrate: 10028-24-7 
  • Heptahydrate: 7782-85-6 
• Grade: Extra Pure (Laboratory Grade) 
• Molecular Weight: 
  • 141.96 g/mol (anhydrous) 
  • 177.99 g/mol (dihydrate) 
• Appearance: White crystalline powder or granules 
• Odor: Odorless 

2. Physical & Chemical Properties

• Solubility: Soluble in water 
• pH (1% solution): ~8.5 – 9.5 
• Melting Point: ~250 °C (decomposes) 
• Density: ~1.7 – 2.0 g/cm³ (varies with hydration) 
• Hygroscopic: Yes, especially in hydrated forms 

3. Safety & Hazard Attributes

• GHS Classification: Not classified as hazardous 
• Hazard Statements: None applicable 
• PPE Requirements: 
  • Safety goggles 
  • Lab coat 
  • Nitrile or latex gloves 
• First Aid Measures: 
  • Inhalation: Move to fresh air 
  • Skin Contact: Wash with soap and water 
  • Eye Contact: Rinse with clean water for several minutes 
  • Ingestion: Rinse mouth; seek medical attention if needed 

4. Storage & Handling Attributes

• Storage Conditions: 
  • Keep tightly closed in a cool, dry place 
  • Avoid exposure to moisture 
  • Store away from incompatible substances (e.g., strong acids) 
• Handling Notes: 
  • Avoid creating dust 
  • Use in well-ventilated areas 
  • Wash hands after handling 

5. Regulatory & Compliance Attributes

• EC Number: 231-448-7 
• UN Number: Not regulated 
• Hazard Class: Non-hazardous for transport 
• REACH Status: Registered

6. Laboratory Applications

• Primary Uses: 
  • Buffering agent in chemical and biochemical laboratories 
  • Component in phosphate-buffered saline (PBS) 
  • Analytical reagent 
  • pH regulation in lab experiments 
• Other Uses: 
  • Model compound for phosphate equilibrium studies 
  • Used in protein precipitation and purification systems