ortho-Phosphoric acid 85%

for analysis EMSURE® ACS,ISO,Reag. Ph Eur

Phosphoric acid, Orthophosphoric acid, o-Phosphoric acid, Orthophosphoric acid
Linear Formula:
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
MDL number:

storage conditions

Store above +15°C.

Quality Level


ACS reagent


reag. ISO
reag. Ph. Eur.

vapor density

3.4 (vs air)

vapor pressure

2.2 mmHg ( 20 °C)
5 mmHg ( 25 °C)


<0.5 (20 °C, 100 g/L in H2O)

kinematic viscosity

30.5 cSt(20 °C)


158 °C (lit.)


~40 °C (lit.)


1.685 g/mL at 25 °C (lit.)

storage temp.

no temp limit

SMILES string




InChI key


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General description

for analysis EMSURE® ACS,ISO,Reag. Ph Eur

Other Notes

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

Analysis Note

Assay (alkalimetric)≥ 85.0 %Identitypasses testAppearance of solutionpasses testColor≤ 10 HazenChloride (Cl)≤ 2 ppmFluoride (F)≤ 1 ppmNitrate (NO₃)≤ 3 ppmPhosphite and Hypophosphite (as H₃PO₃)≤ 20 ppmHypophosphite, phosphitepasses testHeavy metals (as Pb)≤ 10 ppmSulfate (SO₄)≤ 20 ppmAs (Arsenic)≤ 0.5 ppmCa (Calcium)≤ 20 ppmCd (Cadmium)≤ 0.5 ppmCo (Cobalt)≤ 0.5 ppmCu (Copper)≤ 0.5 ppmFe (Iron)≤ 10 ppmK (Potassium)≤ 5 ppmMg (Magnesium)≤ 5 ppmMn (Manganese)≤ 0.5 ppmNa (Sodium)≤ 200 ppmNi (Nickel)≤ 1.0 ppmPb (Lead)≤ 0.5 ppmSb (Antimony)≤ 5 ppmZn (Zinc)≤ 2 ppmMatter precipitated by ammoniapasses testVolatile acids (as Acetic acid)≤ 10 ppmSubstances reducing potassium permanganate (as O)≤ 10 ppmInsoluble matter≤ 10 ppm

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