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Calcium citrate
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Description
Calcium Citrate
Other Names: Tricalcium dicitrate, Calcium salt of citric acid
CAS Number: 813-94-5
Sum Formula: Ca₃(C₆H₅O₇)₂·4H₂O
Molar Mass: 570.50 g/mol (tetrahydrate)
Appearance: White, fine crystalline powder or granules
Calcium citrate is the calcium salt of citric acid, typically supplied in its tetrahydrate form. It is used in technical applications that require a moderately soluble, non-reactive calcium compound with buffering or complexing ability. It is odorless, stable under normal conditions, and dispersible in aqueous systems.
Chemical and Physical Properties
Density: ~2.32 g/cm³
Melting Point: Decomposes above 100°C
Solubility in Water: Slightly soluble (~0.085 g/100 mL at 25°C)
Solubility in Organic Solvents: Practically insoluble
pH (1% solution): ~6.0–8.0
Odor: Odorless
Stability: Stable under dry, ambient conditions
Applications
Used as a buffering agent in technical formulations
Applied in wastewater treatment for phosphate precipitation and metal complexation
Serves as a calcium donor in chemical synthesis and materials processing
Used in ceramics and cement formulations to modify setting behavior
Functions as a stabilizer and dispersant in coatings and polymers
Safety
Signal Word: None (not classified as hazardous under GHS)
First Aid Measures
Eye Contact: Rinse with plenty of water. Seek medical attention if irritation occurs
Skin Contact: Wash thoroughly with soap and water
Inhalation: Move to fresh air if dust is inhaled in large amounts
Ingestion: Rinse mouth with water. Seek medical advice if discomfort occurs
Handling and Storage
Store in a dry, cool, and well-ventilated area
Keep container tightly closed to prevent moisture uptake
Avoid creating dust; use appropriate PPE during handling