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