Customization: | Available |
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CAS No.: | 10101-89-0 |
Formula: | Na3po4.12H2O |
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Chemical Identity:
Trisodium Phosphate (TSP) is an inorganic compound with the chemical formula Na3PO4. Its most prevalent and commercially significant form is the dodecahydrate (Na3PO4·12H2O), which contains 12 water molecules per formula unit.
Key Properties:
Appearance: Colorless or white crystalline solid.
Solubility: Highly soluble in water (forming a strongly alkaline solution).
pH: ~12 in aqueous solution (highly basic).
Molecular Weight: 380.12 g/mol (dodecahydrate).
Stability: Loses water of hydration upon heating, converting to anhydrous Na3PO4.
Test item |
Test Results
|
|
Identification | Passes test | |
Assay(on the ignited basis) | ≥% | 98 |
Pb | ≤mg/kg | 4 |
Fluoride | ≤% | 0.005 |
Insoluble substances | ≤% | 0.2 |
pH value | / | 11.5-12.5 |
As | ≤mg/kg | 3 |
Loss on ignition |
% | 45.0-57.0 |
Primary Applications:
Cleaning & Degreasing:
Historically a key ingredient in heavy-duty cleaners, industrial detergents, and degreasers due to its ability to emulsify oils, remove stains, and soften water.
Note: Use in consumer cleaners has declined in some regions due to environmental regulations (eutrophication concerns).
Water Treatment:
Prevents scale formation (e.g., in boilers) by sequestering calcium/magnesium ions.
Acts as a corrosion inhibitor in industrial water systems.
Food Industry (Food-Grade):
Emulsifier: Stabilizes processed cheeses and meats.
pH Regulator: Adjusts acidity in beverages and baked goods.
Nutrient Supplement: Calcium fortification (when combined with calcium salts).
Regulated as E339(iii) in the EU.
Industrial Processes:
Metal Surface Treatment: Removes rust and prepares surfaces for painting/coating (phosphatization).
Ceramics & Textiles: Binder and detergent in manufacturing.
Laboratory Reagent:
Buffer solution component (pH control).
Precipitation agent in analytical chemistry.
Safety & Handling:
Corrosive: Causes skin/eye irritation; requires PPE (gloves, goggles).
Environmental Impact: Phosphate runoff can contribute to algal blooms; regulated in wastewater.
Synonyms:
Sodium phosphate tribasic
TSP
Trisodium orthophosphate
Hydrate vs. Anhydrous: The dodecahydrate (Na3PO4·12H2O) is safer to handle and store than the anhydrous form (which is hygroscopic and more reactive).