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Phosphoric acid

Name: Phosphoric acid
Brand: SIGALD

ACS reagent, ≥85 wt. % in H₂O

Synonym(s):

Orthophosphoric acid

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About This Item

Linear Formula:

H₃PO₄

CAS Number:

7664-38-2

Molecular Weight:

98.00

Beilstein/REAXYS Number:

1921286

EC Number:

231-633-2

MDL number:

MFCD00011340

UNSPSC Code:

12352106

PubChem Substance ID:

329756407

grade

ACS reagent

Quality Level

200

vapor density

3.4 (vs air)

vapor pressure

2.2 mmHg ( 20 °C)
5 mmHg ( 25 °C)

assay

≥85% (with NaOH, titration)

form

liquid

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concentration

≥85 wt. % in H₂O

technique(s)

NMR: suitable

impurities

Reducing substances, passes test
≤0.001% volatile acids (as CH₃COOH)

color

APHA: ≤10

bp

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 (SO₄^2-): ≤0.003%

cation 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: ≤0.001% (by ICP)

greener alternative category

Enabling,

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

Gene Information

human ... SRC(6714)

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Related Categories

Acids

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General description

Phosphoric acid (H₃PO₄), also known as orthophosphoric acid, is an inorganic acid. It has a wide range of industrial applications such as an intermediate to produce animal feedstock, to prepare stock solutions for workup procedures and to treat the metal surfaces for better adhesion of paint and resin coatings. In the food industry it is used as a preservative, an acidulant and flavor enhancer.

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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.
As an eco-friendly reagent for the removal of protecting groups like tert-butyl carbamates, tert-butyl esters and tert-butyl ethers.

Other Notes

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

pictograms

GHS05,GHS07

signalword

Danger

hcodes

H290 - H302 - H314

pcodes

P234 - P270 - 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

8A - Combustible, corrosive hazardous materials

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c