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345245

Sigma-Aldrich

Phosphoric acid

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

Synonym(s):

Orthophosphoric acid

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About This Item

Linear Formula:
H3PO4
CAS Number:
Molecular Weight:
98.00
Beilstein:
1921286
MDL number:
UNSPSC Code:
26111700
PubChem Substance ID:
NACRES:
NA.23

vapor density

3.4 (vs air)

Quality Level

vapor pressure

2.2 mmHg ( 20 °C)
5 mmHg ( 25 °C)

Assay

99.99% trace metals basis

form

liquid

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concentration

85 wt. % in H2O

bp

158 °C (lit.)

mp

~40 °C (lit.)

density

1.685 g/mL at 25 °C (lit.)

application(s)

battery manufacturing

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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

In aqueous solutions, phosphoric acid behaves as a triprotic acid. The triprotic acid has three ionizable hydrogen atoms, which are lost sequentially.
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.

Application

Industrially, phosphoric acid may be used in fertilizers, detergents, pharmaceuticals, water softeners.
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

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

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

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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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)
Activation of graphene aerogel with phosphoric acid for enhanced electrocapacitive performance
Sun X, et al.
Carbon, 92, 1-10 (2015)
Proton-conducting membranes based on benzimidazole polymers for high-temperature PEM fuel cells. A chemical quest
Asensio JA, et al.
Chemical Society Reviews, 39(8), 3210-3239 (2010)
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)

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