Potassium Phosphate Tribasic CAS 7778-53-2, Potassium Phosphate Tribasic, CAS 7778-53-2
Structure: Colorless orthorhombic crystals or white crystalline powder, a strongly basic phosphate.
7778-53-2
K3PO4
212.266261
231-907-1
| CAS | 7778-53-2 |
| Molecular formula | K3PO4 |
| Molecular weight | 212.266261 |
| EIENCS | 231-907-1 |
| Form | Solid |
| Melting point | 1340 °C |
| boling point | / |
| Density | 2.564 g/mL at 25 °C |
| Solubility | water: soluble100mg/mL, clear, colorless |
| PKA | / |
| Color | White |
| Storage temp | room temp |
Molecular formula: K₃PO₄
Molecular weight: 212.27 g/mol (anhydrous)
Structure: Colorless orthorhombic crystals or white crystalline powder, a strongly basic phosphate.
Appearance: White granular powder or granules, hygroscopic, stable under light.
Physical properties
Melting point :1340℃
Density: 2.564 g/cm³ (17℃)
Water solubility: 51g /100mL (at 25℃), the solution is strongly alkaline (pH 11.5-12.5)
Solubility: Readily soluble in water, insoluble in ethanol and ether
Hygroscopicity: significant (hydrates are more prone to moisture absorption)
Chemical properties:
Strong alkalinity: The pH value of a 1% aqueous solution reaches 11.5 to 12.5, which can neutralize acidic substances.
Stability: Decomposes at high temperatures and generates phosphate and potassium salts when encountering acids.
1. Food industry (accounting for 45% of global demand
Emulsifiers and stabilizers: They are used in dairy products and meat products to improve texture. For example, the addition limit for luncheon meat is 3g/kg (calculated as P₂O₅).
Acidity regulator: Adjusts the pH value in beverages (such as cola) to enhance flavor.
Nutritional fortifiers: Supplement potassium. The FAO/WHO stipulates that the limit in milk powder is 5g/kg.
2. Industrial field
Detergent manufacturing: A core component of liquid soap, enhancing foam stability.
Water treatment: Boiler water softener, inhibits scale formation, corrosion inhibition rate over 90%.
Metal surface treatment: Electroplating degreaser, enhancing the corrosion resistance of metals.
3. Agriculture and Environmental Protection
Fertilizer: It provides phosphorus and potassium elements and promotes crop growth (especially suitable for high-yield farmland).
Soil improvement: Regulate the pH value of acidic soil and enhance the utilization rate of nutrients.
4. Emerging applications
Battery materials: Lithium-ion battery electrolyte additives, with an annual demand growth rate of over 15%.
Pharmaceutical excipients: Components of drug sustained-release agents (must meet the purity requirements of pharmaceutical grade ≥99.5%).
Health risk
Irritation: Contact with skin or eyes may cause redness, swelling and burns (R38/R41 risk terms).
Ingestion toxicity: Excessive intake causes diarrhea. The ADI limit is 70mg/kg (calculated as phosphorus).
Operation protection
Protective equipment: Nitrile gloves, goggles, dust masks (work area concentration ≤20mg/m³).
Storage conditions: Sealed and protected from light, humidity < 60%, away from acids and oxidants.
Environmental risk
It has low toxicity to aquatic organisms (LC₅₀ > 1000mg/L for fish), but is prohibited from being discharged into water bodies.
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