695017

Acide phosphorique

ACS reagent, ≥85 wt. % in H₂O

• Synonyme(s) : Acide orthophosphorique
• Formule linéaire : H₃PO₄
• Numéro CAS: 7664-38-2
• Poids moléculaire : 98.00
• Numéro Beilstein : 1921286
• Numéro CE : 231-633-2
• Numéro MDL: MFCD00011340
• Code UNSPSC : 12352106
• ID de substance PubChem : 329761708
• Nomenclature NACRES : NA.21

Propriétés

• Qualité: ACS reagent
• Densité de vapeur: 3.4 (vs air)
• Pression de vapeur: 2.2 mmHg ( 20 °C); 5 mmHg ( 25 °C)
• Pureté: ≥85% H₃PO₄ basis (by NaOH, titration)
• Forme: liquid
• Concentration: ≥85 wt. % in H₂O
• Technique(s): NMR: suitable
• Impuretés: reducing substances, passes test; ≤0.001% volatile acids (as CH₃COOH)
• Couleur: APHA: ≤10
• Point d'ébullition: 158 °C (lit.)
• Pf: ~40 °C (lit.)
• Densité: 1.685 g/mL at 25 °C (lit.)
• Traces d'anions: chloride (Cl^-): ≤3 ppm; nitrate (NO₃^-): ≤5 ppm; sulfate (SO₄^2-): ≤0.003%
• Traces de cations: 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: ≤0.001% (by ICP)
• Chaîne SMILES: OP(O)(O)=O
• InChI: 1S/H3O4P/c1-5(2,3)4/h(H3,1,2,3,4)
• Clé InChI: NBIIXXVUZAFLBC-UHFFFAOYSA-N
• Informations sur le gène: human ... SRC(6714)

Description

Description générale

Phosphoric acid (H₃PO₄) is useful in industry for treating the metal surfaces to obtain better adhesion of paint and resin coatings.

Application

Phosphoric acid may be employed as standard for the determination of phosphorus-31 nuclear magnetic resonance (³¹P NMR) chemical shifts of the common phospholipids. It may be employed in the following studies:

• As external standard for the analysis of lipid composition of human white matter by ³¹P NMR spectroscopy.
• As external standard during the acid-labile phosphorylation of histone H4 by ³¹P NMR spectroscopy.
• As reference standard to investigate the surface species present on silica/alumina-supported sodium phosphates by pre- and postreaction MAS³¹P-NMR and FTIR spectroscopies.
• As catalyst in the vapor-phase Fries rearrangement of phenylacetate at 623K over a series of surface modified and unmodified ZSM-5.

Autres remarques

L′acide phosphorique concentré est composé de H₃PO₄ à environ 85 % (aqueux).

Informations sur la sécurité

• Pictogrammes: GHS05,GHS07
• Mention d'avertissement: Danger
• Mentions de danger: H290,H302,H314
• Conseils de prudence: P234 - P280 - P301 + P312 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
• Classification des risques: Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1B
• Code de la classe de stockage: 8B - Non-combustible corrosive hazardous materials
• Classe de danger pour l'eau (WGK): WGK 1
• Point d'éclair (°F): Not applicable
• Point d'éclair (°C): Not applicable