Merck
All Photos(2)

1.00565

Supelco

ortho-Phosphoric acid 99%

cryst. for analysis EMSURE®

Synonym(s):
Phosphoric acid, Orthophosphoric acid, Orthophosphoric acid, o-Phosphoric acid
Linear Formula:
H3PO4
CAS Number:
Molecular Weight:
98.00
Beilstein:
1921286
MDL number:
EC Index Number:
231-633-2

Quality Level

vapor density

3.4 (vs air)

vapor pressure

2.2 mmHg ( 20 °C)
5 mmHg ( 25 °C)

product line

EMSURE®

assay

≥99% (acidimetric)

form

solid

potency

2740 mg/kg LD50, skin (Rabbit)

concentration

85% phosphoric acid

impurities

≤20 ppm Substances reducing potassium permanganate (as O)
≤20 ppm Volatile acids (as CH3COOH)

pH

<0.5 (20 °C, 100 g/L in H2O)

bp

158 °C (lit.)

mp

~40 °C (lit.)

solubility

750-850 g/L

density

1.685 g/mL at 25 °C (lit.)
1.84 g/cm3 at 38 °C

anion traces

chloride (Cl-): ≤2 ppm
fluoride (F-): ≤0.5 ppm
nitrate (NO3-): ≤2 ppm
phosphite, hypophosphite (as H3PO3): ≤500 ppm

cation traces

As: ≤1 ppm
Ca: ≤20 ppm
Cd: ≤1 ppm
Co: ≤1 ppm
Cu: ≤1 ppm
Fe: ≤10 ppm
K: ≤5 ppm
Mg: ≤1 ppm
Mn: ≤1 ppm
Na: ≤50 ppm
Ni: ≤1 ppm
Pb: ≤1 ppm
Sb: ≤1 ppm
Zn: ≤1 ppm

storage temp.

2-30°C

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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Other Notes

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

Analysis Note

Assay (acidimetric): ≥ 99 %
Identity: passes test
Chloride (Cl): ≤ 2 ppm
Nitrate (NO₃): ≤ 2 ppm
Phosphite and Hypophosphite (as H₃PO₃): ≤ 500 ppm
Fluoride (F): ≤ 0.5 ppm
As (Arsenic): ≤ 1 ppm
Ca (Calcium): ≤ 20 ppm
Cd (Cadmium): ≤ 1 ppm
Co (Cobalt): ≤ 1 ppm
Cu (Copper): ≤ 1 ppm
Fe (Iron): ≤ 10 ppm
K (Potassium): ≤ 5 ppm
Mg (Magnesium): ≤ 1 ppm
Mn (Manganese): ≤ 1 ppm
Na (Sodium): ≤ 50 ppm
Ni (Nickel): ≤ 1 ppm
Pb (Lead): ≤ 1 ppm
Sb (Antimony): ≤ 1 ppm
Zn (Zinc): ≤ 1 ppm
Volatile acids (as CH₃COOH): ≤ 20 ppm
Substances reducing potassium permanganate (as O): ≤ 20 ppm

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany

Pictograms

CorrosionExclamation mark

Signal Word

Danger

Hazard Statements

Hazard Classifications

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

Storage Class Code

8B - Non-combustible, corrosive hazardous materials

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Quality

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