Orthophosphoric Acid

CAS #: 7664-38-2

Chemical Formula: H3PO4

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Catalogue Number100573
Synonymso-Phosphoric acid, Orthophosphoric acid
Product Information
CAS number7664-38-2
GradeACS,ISO,Reag. Ph Eur
HS Code2809 20 11
Physicochemical Information
Boiling point158 °C (1013 mbar)
Density1.71 g/cm3 (20 °C)
Melting Point21 °C
pH value<0.5 (100 g/l, H₂O, 20 °C)
Vapor pressure2 hPa (20 °C)
Viscosity kinematic30.5 mm2/s (20 °C)
Safety Information according to GHS
Hazard Pictogram(s)Hazard Pictogram(s)Hazard Pictogram(s)
Hazard Pictogram(s)Hazard Pictogram(s)
Hazard Statement(s)H290: May be corrosive to metals.
H302: Harmful if swallowed.
H314: Causes severe skin burns and eye damage.
Precautionary Statement(s)P234: Keep only in original packaging.
P280: Wear protective gloves/ protective clothing/ eye protection/ face protection/ hearing protection.
P301 + P312: IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell.
P303 + P361 + P353: IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water.
P304 + P340 + P310: IF INHALED: Remove person to fresh air and keep comfortable for breathing. Immediately call a POISON CENTER/doctor.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Signal WordDanger
Storage class8B Non-combustible, corrosive hazardous materials
WGKWGK 1 slightly hazardous to water
Inorganic acids and anhydrides thereof should first be diluted or hydrolyzed by stirring carefully into ice water and then neutralized (protective gloves, fume cupboard!) with sodium hydroxide solution (Cat. No. 105587). Before filling into container D, check the pH with pH universal indicator strips (Cat. No. 109535). Fuming sulfuric acid should be carefully stirred dropwise into 40 % sulfuric acid (Cat. No. 109286). Ensure that plenty of ice is available for cooling! When sufficiently cool, treat the highly concentrated sulfuric acid as described above. Analogous to this procedure, other anhydrides can be converted into their corresponding acids. Acid gases (e.g. hydrogen halide, chlorine, phosgene, sulfur dioxide) can be introduced into dilute sodium hydroxide solution and after neutralization disposed of in container D.
Safety Information
Categories of danger Corrosive
Storage and Shipping Information
StorageNo Temp Limit
Transport Information
Declaration (railroad and road) ADR, RIDUN 1805 , 8, III
Declaration (transport by air) IATA-DGRUN 1805 , 8, III
Declaration (transport by sea) IMDG-CodeUN 1805 , 8, III, Segregation Group: 1 (Acids)
Assay (alkalimetric)≥ 85.0 %
Identitypasses test
Appearance of solutionpasses test
Color≤ 10 Hazen
Chloride (Cl)≤ 2 ppm
Fluoride (F)≤ 1 ppm
Nitrate (NO₃)≤ 3 ppm
Phosphite and Hypophosphite (as H₃PO₃)≤ 20 ppm
Hypophosphite, phosphitepasses test
Heavy metals (as Pb)≤ 10 ppm
Sulfate (SO₄)≤ 20 ppm
As (Arsenic)≤ 0.5 ppm
Ca (Calcium)≤ 20 ppm
Cd (Cadmium)≤ 0.5 ppm
Co (Cobalt)≤ 0.5 ppm
Cu (Copper)≤ 0.5 ppm
Fe (Iron)≤ 10 ppm
K (Potassium)≤ 5 ppm
Mg (Magnesium)≤ 5 ppm
Mn (Manganese)≤ 0.5 ppm
Na (Sodium)≤ 200 ppm
Ni (Nickel)≤ 1.0 ppm
Pb (Lead)≤ 0.5 ppm
Sb (Antimony)≤ 5 ppm
Zn (Zinc)≤ 2 ppm
Matter precipitated by ammoniapasses test
Volatile acids (as Acetic acid)≤ 10 ppm
Substances reducing potassium permanganate (as O)≤ 10 ppm
Insoluble matter≤ 10 ppm
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