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Merck
CN

79622-M

Phosphoric acid

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

Synonym(s):

Orthophosphoric acid

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About This Item

Linear Formula:
H3PO4
CAS Number:
Molecular Weight:
98.00
UNSPSC Code:
12352106
NACRES:
NA.21
PubChem Substance ID:
EC Number:
231-633-2
Beilstein/REAXYS Number:
1921286
MDL number:
eCl@ss:
38070202
Assay:
≥99.0% (T)
Form:
crystalline
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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

crystalline

quality

crystallized

impurities

≤0.002% KMnO4-reducing matter (as O)

bp

158 °C (lit.)

mp

~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

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.

Other Notes

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

Disclaimer

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


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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

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Information

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