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79622

Sigma-Aldrich

Phosphoric acid

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

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Synonym(s):
Orthophosphoric acid
Linear Formula:
H3PO4
CAS Number:
Molecular Weight:
98.00
Beilstein/REAXYS Number:
1921286
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

vapor density

3.4 (vs air)

Quality Level

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

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1 of 4

This Item
466123438081695017
Phosphoric acid puriss. p.a., crystallized, ≥99.0% (T)

79622

Phosphoric acid

Phosphoric acid crystalline, ≥99.999% trace metals basis

466123

Phosphoric acid

Phosphoric acid ACS reagent, ≥85 wt. % in H2O

438081

Phosphoric acid

Phosphoric acid ACS reagent, ≥85 wt. % in H2O

695017

Phosphoric acid

assay

≥99.0% (T)

assay

≥99.999% trace metals basis

assay

≥85% (with NaOH, titration)

assay

≥85% H3PO4 basis (by NaOH, titration)

form

powder or crystals

form

crystalline

form

liquid

form

liquid

solubility

water: 850 g/L at 20 °C

solubility

-

solubility

-

solubility

-

anion traces

chloride (Cl-): ≤5 mg/kg, phosphite, hypophosphite (as H3PO3): ≤500 mg/kg, nitrate (NO3-): ≤5 mg/kg, sulfate (SO42-): ≤30 mg/kg

anion traces

-

anion traces

chloride (Cl-): ≤3 ppm, nitrate (NO3-): ≤5 ppm, sulfate (SO42-): ≤0.003%

anion traces

chloride (Cl-): ≤3 ppm, nitrate (NO3-): ≤5 ppm, sulfate (SO42-): ≤0.003%

cation traces

As: ≤1 mg/kg, Cd: ≤1 mg/kg, Cr: ≤1 mg/kg, Fe: ≤10 mg/kg, Mg: ≤1 mg/kg, Na: ≤50 mg/kg, Pb: ≤1 mg/kg, Co: ≤1 mg/kg, K: ≤5 mg/kg, Ni: ≤1 mg/kg, Ca: ≤10 mg/kg, Mn: ≤1 mg/kg, Cu: ≤1 mg/kg, Zn: ≤1 mg/kg

cation traces

-

cation traces

As: ≤1 ppm, Ca: ≤0.002%, Fe: ≤0.003%, K: ≤0.005%, Mg: ≤0.02%, Mn: ≤0.5 ppm, Na: ≤0.025%, Sb: ≤0.002%, heavy metals: ≤0.001% (by ICP)

cation traces

As: ≤1 ppm, Ca: ≤0.002%, Fe: ≤0.003%, K: ≤0.005%, Mg: ≤0.02%, Mn: ≤0.5 ppm, Na: ≤0.025%, Sb: ≤0.002%, heavy metals: ≤0.001% (by ICP)

General description

Phosphoric acid (H3PO4) is also known as orthophosphoric acid. It serves as an intermediary or reagent in various manufacturing processes. Phosphoric acid is found in fertilizers, detergents, and other household cleaning products.
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.
Phosphoric acid is used:
  • As a catalyst in the nucleophilic addition to imines.
  • In the synthesis of porous phosphoric acid-based geopolymers.
  • In the synthesis of mono-alkyl phosphates from simple aliphatic alcohols in the presence of acetic anhydride activator.

Other Notes

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

Caution

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

pictograms

CorrosionExclamation mark

signalword

Danger

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1B

Storage Class

8A - Combustible, corrosive hazardous materials

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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