Trisodium phosphate

Not to be confused with Sodium triphosphate.

Trisodium phosphate[1]
Trisodium phosphate

  Sodium, Na
  Phosphorus, P
  Oxygen, O

Trisodium phosphate hydrate
Names
IUPAC name
Trisodium phosphate
Other names
  • Sodium phosphate
  • Sodium phosphate tribasic
  • Trisodium orthophosphate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.028.645 Edit this at Wikidata
EC Number
  • 231-509-8
E number E339(iii) (antioxidants, ...)
KEGG
RTECS number
UNII
  • InChI=1S/3Na.H3O4P/c;;;1-5(2,3)4/h;;;(H3,1,2,3,4)/q3*+1;/p-3 checkY
    Key: RYFMWSXOAZQYPI-UHFFFAOYSA-K checkY
  • InChI=1/3Na.H3O4P/c;;;1-5(2,3)4/h;;;(H3,1,2,3,4)/q3*+1;/p-3
    Key: RYFMWSXOAZQYPI-DFZHHIFOAM
  • [O-]P(=O)([O-])[O-].[Na+].[Na+].[Na+]
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]
  • anhydrous:[3]
  • 5.4 g/(100 mL) (0 °C)
  • 12 g/(100 mL) (20 °C)[5]
  • 14.5 g/(100 mL) (25 °C)
  • 23.3 g/(100 mL) (40 °C)
  • 94.6 g/(100 mL) (100 °C)
  • dodecahydrate:[4]
  • 28.3 g/(100 mL) (20 °C)
Solubility Insoluble in ethanol, carbon disulfide[4]
Basicity (pKb) 2.23
Structure
Trigonal
Thermochemistry
665 J/(mol·K) (dodecahydrate)[4]
224.7 J/(mol·K) (anhydrous)[3]
660 J/(mol·K) (dodecahydrate)[4]
−1935.5 kJ/mol (anhydrous)[3]
−5480 kJ/mol (dodecahydrate)[4]
−1819 kJ/mol (anhydrous)[3]
Pharmacology
A06AD17 (WHO) A06AG01 (WHO) B05XA09 (WHO)
Hazards[6]
GHS labelling:
GHS05: CorrosiveGHS07: Exclamation mark
Danger
H315, H318, H335
P261, P280, P305+P351+P338
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
2
0
1
Flash point Non-flammable
Safety data sheet (SDS) ICSC 1178
Related compounds
Other cations
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

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]

As an item of commerce TSP 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.

  1. ^ Merck Index, 12th Edition, 8808.
  2. ^ Eagleson, Mary, ed. (1994). Concise Encyclopedia Chemistry. Walter de Gruyter. p. 1000. ISBN 978-3-11-011451-5. Retrieved 25 May 2014.
  3. ^ a b c d e f "Sodium phosphate".
  4. ^ a b c d e f g h "Sodium phosphate dodecahydrate".
  5. ^ "Archived copy" (PDF). Archived from the original (PDF) on 14 March 2016. Retrieved 25 May 2014.{{cite web}}: CS1 maint: archived copy as title (link)
  6. ^ Sigma-Aldrich Co., Sodium phosphate. Retrieved on 2014-05-25.
  7. ^ Cite error: The named reference Ullmann was invoked but never defined (see the help page).