79622

Phosphoric acid

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

• Synonym(s): Orthophosphoric acid
• Linear Formula: H₃PO₄
• CAS Number: 7664-38-2
• Molecular Weight: 98.00
• Beilstein: 1921286
• EC Number: 231-633-2
• MDL number: MFCD00011340
• UNSPSC Code: 12352106
• PubChem Substance ID: 329768533
• NACRES: NA.21

Properties

• vapor density: 3.4 (vs air)
• Quality Level: 200
• vapor pressure: 2.2 mmHg ( 20 °C); 5 mmHg ( 25 °C)
• grade: puriss. p.a.
• Assay: ≥99.0% (T)
• form: powder or crystals
• quality: crystallized
• impurities: ≤0.002% KMnO₄-reducing matter (as O)
• bp: 158 °C (lit.)
• mp: ~40 °C (lit.); ~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 (SO₄^2-): ≤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

Description

General description

Phosphoric acid (H₃PO₄) is also known as orthophosphoric acid. It serves as an intermediary or reagent in various manufacturing processes. Phosphoric acid is found in fertilizers, detergents, and other household cleaning products.

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.

Phosphoric acid is used:

• As a catalyst in the nucleophilic addition to imines.
• In the synthesis of porous phosphoric acid-based geopolymers.
• In the synthesis of mono-alkyl phosphates from simple aliphatic alcohols in the presence of acetic anhydride activator.

Other Notes

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

Caution

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

Safety Information

• Pictograms: GHS05,GHS07
• Signal Word: Danger
• Hazard Statements: H290,H302,H314
• Precautionary Statements: P234 - P260 - P280 - P301 + P312 - P303 + P361 + P353 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1B
• Storage Class Code: 8A - Combustible corrosive hazardous materials
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable