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Specifications Synonym: Orthophosphoric acidCAS Number: 7664-38-2Linear Formula: H3PO4Molecular Weight: 98.00Beilstein Registry Number: 1921286EC Number: 231-633-2MDL Number: MFCD00011340PubChem Substance ID: 24867422Other Notes Concentrated phosphoric acid is approx. 85% H3PO4 (aqueous).Packaging 2.5, 6×2.5 L in PVC coated; 20 L in poly drum; 500, 6×500 mL in PVC coatedGrade: ACS reagentVapor Density: 3.4 (vs air)Vapor Pressure: 2.2 mmHg ( 20 °C); 5 mmHg ( 25 °C)Concentration: =85 wt. % in H2OImpurities: Reducing substances, passes test; =0.001% volatile acids (as CH3COOH)Color: APHA: =10BP: 158 °C(lit.)MP: ~40 °C(lit.)Density: 1.685 g/mL at 25 °C(lit.)Anion Traces: chloride (Cl-): =3 ppm; nitrate (NO3-): =5 ppm; sulfate (SO42-): =0.003�tion 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 (as Pb): =0.001%Gene Information: human ... SRC