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Sigma-Aldrich

Phosphoric acid

greener alternative

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/REAXYS Number:
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

greener alternative product characteristics

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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

greener alternative category

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

signalword

Danger

Hazard Classifications

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

Storage Class

8B - Non-combustible corrosive hazardous materials

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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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)
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)
Activation of graphene aerogel with phosphoric acid for enhanced electrocapacitive performance
Sun X, et al.
Carbon, 92, 1-10 (2015)
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)

Articles

Acid and base chart lists the strength of acids and bases (strongest to weakest) in order. Simple to use laboratory reference chart for scientists, researchers and lab technicians.

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