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345245

Sigma-Aldrich

Phosphoric acid

greener alternative

85 wt. % in H2O, 99.99% trace metals basis

Synonym(s):
Orthophosphoric acid
Linear Formula:
H3PO4
CAS Number:
Molecular Weight:
98.00
Beilstein:
1921286
MDL number:
PubChem Substance ID:
NACRES:
NA.23

Quality Level

vapor density

3.4 (vs air)

vapor pressure

2.2 mmHg ( 20 °C)
5 mmHg ( 25 °C)

assay

99.99% trace metals basis

form

liquid

greener alternative product characteristics

Design for Energy Efficiency
Learn more about the Principles of Green Chemistry.

concentration

85 wt. % in H2O

bp

158 °C (lit.)

mp

~40 °C (lit.)

density

1.685 g/mL at 25 °C (lit.)

Featured Industry

Battery Manufacturing

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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General description

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has been enhanced for energy efficiency. Find details here.
In aqueous solutions, phosphoric acid behaves as a triprotic acid. The triprotic acid has three ionizable hydrogen atoms, which are lost sequentially.

Application

Phosphoric acid (85 wt. % in H2O) can be used for a variety of applications, such as:
  • a medium for corrosion inhibition on mild steel
  • an activating agent in the preparation of activated carbon
  • enhancement of electrochemical performance for energy devices
  • in the development of polymeric membranes for proton exchange membrane based fuel cells

Industrially, phosphoric acid may be used in fertilizers, detergents, pharmaceuticals, water softeners.
Phosphoric acid has been used as an acid solution for pH adjustment of the fermentation broth in a protocol for the acetone-butanol-ethanol (ABE) fermentation of sugars in a bioreactor.

Packaging

100, 500 mL in glass bottle
Packaged in clear glass bottles

Other Notes

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

Pictograms

CorrosionExclamation mark

Signal Word

Danger

Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1B

Storage Class Code

8B - Non-combustible, corrosive hazardous materials

WGK Germany

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Production of an acetone-butanol-ethanol mixture from Clostridium acetobutylicum and its conversion to high-value biofuels.
Sreekumar S, et al.
Nature Protocols, 10(3), 528-537 (2015)
Preparation and characterization of activated carbon from bamboo by microwave-induced phosphoric acid activation
Liu Q, et al.
Industrial Crops and Products, 31(2), 233-238 (2010)
Physicochemical properties of phosphoric acid doped polybenzimidazole membranes for fuel cells
He R, et al.
Journal of Membrane Science , 277(1-2), 38-45 (2006)
Proton conductivity of phosphoric acid doped polybenzimidazole and its composites with inorganic proton conductors
He R, et al.
Journal of Membrane Science , 226(1-2), 169-184 (2003)
Eco friendly inhibitor for corrosion inhibition of mild steel in phosphoric acid medium
Gunasekaran G and Chauhan LR
Electrochimica Acta, 49(25), 4387-4395 (2004)

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