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Sigma-Aldrich

meta-Phosphoric acid

ACS reagent, chips, 33.5-36.5%

Synonym(s):

Metaphosphoric acid

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About This Item

Linear Formula:
(HPO3)n
CAS Number:
37267-86-0
MDL number:
MFCD00011351
UNSPSC Code:
12352106
PubChem Substance ID:
329752524
NACRES:
NA.21

grade

ACS reagent

form

chips

contains

57.0-63.0% sodium phosphite as stabilizer

concentration

33.5-36.5%

density

2 g/cm3

anion traces

MnO4- reducers: ≤0.02%
chloride (Cl-): ≤0.001%
nitrate (NO3-): ≤0.001%
sulfate (SO42-): ≤0.005%

cation traces

As: ≤1 ppm
Fe: ≤0.005%
heavy metals: ≤0.005% (by ICP)

SMILES string

OP(=O)=O

InChI

1S/HO3P/c1-4(2)3/h(H,1,2,3)

InChI key

UEZVMMHDMIWARA-UHFFFAOYSA-N

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General description

meta-Phosphoric acid is a polymer form of phosphoric acid. It is used as a catalyst as well as a reactant in chemical synthesis.

Application

meta-Phosphoric acid can be used as:      
  • A catalyst in combination with InCl3 to synthesize 1,8-dioxooctahydroxanthene derivatives by the reaction of cyclic β-diketones and aldehydes.      
  • A phosphate precursor to synthesize antimony phosphate (SbPO4) by reacting with antimony metal at high temperatures.

pictograms

Corrosion
GHS05

signalword

Danger

hcodes

H314

Hazard Classifications

Eye Dam. 1 - Skin Corr. 1

Storage Class

8B - Non-combustible corrosive hazardous materials

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

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