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79622 Sigma-Aldrich

Phosphoric acid

puriss. p.a., crystallized, ≥99.0% (T)

Synonym: Orthophosphoric acid

  • CAS Number 7664-38-2

  • Linear Formula H3PO4

  • Molecular Weight 98.00

  •  Beilstein/REAXYS Number 1921286

  •  EC Number 231-633-2

  •  MDL number MFCD00011340

  •  PubChem Substance ID 329768533

  •  NACRES NA.21

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Properties

Related Categories Acids, Acids & Bases, Analytical Reagents, Analytical Reagents for General Use, Analytical/Chromatography,
Quality Level   200
vapor density   3.4 (vs air)
vapor pressure   2.2 mmHg ( 20 °C)
  5 mmHg ( 25 °C)
grade   puriss. p.a.
assay   ≥99.0% (T)
form   powder or crystals
quality   crystallized
impurities   ≤0.002% KMnO4-reducing matter (as O)
bp   158 °C (lit.)
mp   ~40 °C (lit.)
  ~40 °C
solubility   water: 850 g/L at 20 °C
density   1.685 g/mL at 25 °C (lit.)
anion traces   chloride (Cl-): ≤5 mg/kg
  nitrate (NO3-): ≤5 mg/kg
  phosphite, hypophosphite (as H3PO3): ≤500 mg/kg
  sulfate (SO42-): ≤30 mg/kg
cation traces   As: ≤1 mg/kg
  Ca: ≤10 mg/kg
  Cd: ≤1 mg/kg
  Co: ≤1 mg/kg
  Cr: ≤1 mg/kg
  Cu: ≤1 mg/kg
  Fe: ≤10 mg/kg
  K: ≤5 mg/kg
  Mg: ≤1 mg/kg
  Mn: ≤1 mg/kg
  Na: ≤50 mg/kg
  Ni: ≤1 mg/kg
  Pb: ≤1 mg/kg
  Zn: ≤1 mg/kg
SMILES string   OP(O)(O)=O
InChI   1S/H3O4P/c1-5(2,3)4/h(H3,1,2,3,4)
InChI key   NBIIXXVUZAFLBC-UHFFFAOYSA-N

Description

General description

The product is crystalline phosphoric acid.

Application

Phosphoric acid has been employed as an oxidation reagent in a study.1 It may be used in the preparation of ammonium phosphate.

Packaging

1 kg in glass bottle

100, 500 g in glass bottle

Other Notes

Concentrated phosphoric acid is approx. 85% H3PO4 (aqueous).

Caution

product may become solid, becomes liquid on heating to 50°C

Safety & Documentation

Safety Information

Symbol 
Signal word 
Danger
Hazard statements 
RIDADR 
UN 3453 8 / PGIII
WGK Germany 
WGK 1
RTECS 
TB6300000
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable
Protocols & Articles

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