Trisodium phosphate
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Not to be confused with Sodium triphosphate.
Trisodium phosphate (TSP) is an inorganic compound with the chemical formula Na3PO4. It is a white, granular or crystalline solid, highly soluble in water, producing an alkaline solution. TSP is used as a cleaning agent, builder, lubricant, food additive, stain remover, and degreaser.[7]
Quick Facts Names, Identifiers ...
Sodium, Na Phosphorus, P Oxygen, O | |
Trisodium phosphate hydrate | |
Names | |
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IUPAC name
Trisodium phosphate | |
Other names
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Identifiers | |
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3D model (JSmol) |
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ChEBI | |
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ChemSpider |
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ECHA InfoCard | 100.028.645 |
EC Number |
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E number | E339(iii) (antioxidants, ...) |
KEGG |
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PubChem CID |
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RTECS number | |
UNII |
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CompTox Dashboard (EPA) |
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Properties | |
Na3PO4 | |
Molar mass | 163.939 g·mol−1 |
Appearance | White, granular or crystalline solid |
Density | 2.536 g/cm3 (17.5 °C, anhydrous) 1.62 g/cm3 (20 °C, dodecahydrate)[2][3][4] |
Melting point | 1,583 °C (2,881 °F; 1,856 K) (anhydrous)[3] 73.4 °C (164.1 °F; 346.5 K) (dodecahydrate)[4] |
Boiling point | 100 °C (212 °F; 373 K) (dodecahydrate) decomposes[4] |
Solubility | Insoluble in ethanol, carbon disulfide[4] |
Basicity (pKb) | 2.23 |
Structure | |
Trigonal | |
Thermochemistry | |
Heat capacity (C) |
665 J/(mol·K) (dodecahydrate)[4] |
Std molar entropy (S⦵298) |
224.7 J/(mol·K) (anhydrous)[3] 660 J/(mol·K) (dodecahydrate)[4] |
Std enthalpy of formation (ΔfH⦵298) |
−1935.5 kJ/mol (anhydrous)[3] −5480 kJ/mol (dodecahydrate)[4] |
Gibbs free energy (ΔfG⦵) |
−1819 kJ/mol (anhydrous)[3] |
Pharmacology | |
A06AD17 (WHO) A06AG01 (WHO) B05XA09 (WHO) | |
Hazards[6] | |
GHS labelling: | |
Danger | |
H315, H318, H335 | |
P261, P280, P305+P351+P338 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Safety data sheet (SDS) | ICSC 1178 |
Related compounds | |
Other cations |
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Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Close
The item of commerce is often partially hydrated and may range from anhydrous Na3PO4 to the dodecahydrate Na3PO4·12H2O. Most often it is found in white powder form. It can also be called trisodium orthophosphate or simply sodium phosphate.