Metaphosphoric Acid
Basic information
- CAS
10343-62-1- Standard SMILES
O=P(=O)O- InChIKey
UEZVMMHDMIWARA-UHFFFAOYSA-N- Molecular formula
- HO3P
- Average molar mass
- 79.98 g/mol
- Monoisotopic mass
- 79.96633089
Overview
Phosphonate(1-) is a monovalent inorganic anion obtained by deprotonation of one of the two OH groups in phosphonic acid. It is a phosphorus oxoanion and a monovalent inorganic anion. It is a conjugate base of a phosphonic acid. It is a conjugate acid of a phosphonate(2-).
Names & identifiers
- Preferred name
- Metaphosphoric Acid
- IUPAC
- phosphenic acid
- English name
- Metaphosphoric acid
- Molecular formula
- HO3P
- Molecular weight
- 79.98
Names & synonyms
Metaphosphoric acid37267-86-0Phosphenic acidMTK99R3UV0RefChem:156792DTXSID301015564233-750-4253-433-4meta-Phosphoric acid10343-62-1hydrogenphosphonatePhosphoric acid meta
Show more names
metaphosphoricM-PHOSPHORIC ACIDMetaphosphoricaciM-PhosphoricAcidGrPHOSPHORIC ACID, METAstabilized with NaPO3Metaphosphoricacid,ACSmeta-PHOSPHORIC ACID ARM-PHOSPHORIC ACID STICKS
Metaphosphoric acid (HPO3)HO3PUNII-MTK99R3UV0M phosphoric acidphosphonate(1-)EINECS 253-433-4hydrogen phosphonate ionMFCD00011351
Database identifiers
- CAS
10343-62-1、37267-86-0- PubChem CID
- 3084658
- DTXSID
DTXSID10893985- ChEBI
CHEBI:33462- EC Number
- 233-750-4、253-433-4
- Nikkaji
- J96.455G
Properties
Computed structural properties
- XLogP
- -1.2
- Topological polar surface area
- 54.4 Ų
- Hydrogen bond donors
- 1
- Hydrogen bond acceptors
- 3
- Rotatable bonds
- 0
- Heavy atoms
- 4
- Formal charge
- 0
- Complexity
- 46.2
Experimental & physicochemical properties
Chemical ClassesToxic Gases & Vapors -> Acids, Inorganic
Cosmetics
Cosmetic ingredients (Metaphosphoric Acid) -> CIR (Cosmetic Ingredient Review)
Buffering; Chelating
Boiling Point260 °C @760 [mm Hg]
Vapor Pressure0.03 [mm Hg] @25 °C
Physical DescriptionColorless odorless solid; [Merck Eurolab MSDS]
Physicochemical properties
- Melting point
- 21 °C · 21°C
- Boiling point
- 158 °C · 158°C
- bulk density
- 1000 kg/m3 · 1000kg/m3
- Density
- 2 g/cm3 · 2 g/cm3
- vapor pressure
- 0.04 hPa · 0.04 hPa at 20 °C
- storage temp.
- 30 °C · Store below +30°C.
- solubility
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
Danger
H314 (100%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
P260, P261, P264, P264+P265, P271, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P319, P321, P363, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 61 reports by companies from 4 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
This chemical does not meet GHS hazard criteria for 100% (3 of 3) of all reports.
Not Classified
Hazard information
Regulatory Information
Chemical: Metaphosphoric acid (HPO3)
Chemical: Metaphosphoric acid
Metaphosphoric acid (HPO3): Does not have an individual approval but may be used under an appropriate group standard
Metaphosphoric acid: Does not have an individual approval but may be used under an appropriate group standard
Hazards SummaryCauses burns; Inhalation may cause corrosive injuries to upper respiratory tract and lungs; [Merck Eurolab MSDS] See Phosphoric acid.
Hazard Classes and Categories
Skin Corr. 1B (100%)
Not Classified
Safety & protection
Protective Action Criteria (PAC)
30 [mg/m3]
330 [mg/m3]
2000 [mg/m3]
Toxicology
Chemistry & industry
Uses & manufacturing
UsesCIR ingredient: Metaphosphoric Acid
Use ClassificationCosmetics -> Buffering; Chelating
General Manufacturing InformationMetaphosphoric acid: ACTIVE
Applications
UsesAn inorganic reagent used for research purposes
UsesMetaphosphoric acid is used as a dehydrating agent. Its derivative, sodium hexametaphosphate is used as a sequestrant and a food additive. It is also used as phosphorylating agent, analytical reagent and in dental cements.
UsesIn dentistry for making zinc oxyphosphate cement; as reagent in chemical analysis.
General Descriptionmeta-Phosphoric acid is a monobasic acid.
Preparation methods
PreparationMetaphosphoric acid is obtained as a polymeric glassy solid by prolonged heating of phosphoric acid. Either phosphoric acid, H3PO4, or pyrophosphoric acid, H4P2O7, when heated above 300°C, on cooling yields the transparent glassy mass of composition (HPO3)n. Metaphosphoric acid also is obtained from partial hydration of phosphorus pentoxide by dissolving it in cold water.
Additional notes
DefinitionChEBI: Phosphonate(1-) is a monovalent inorganic anion obtained by deprotonation of one of the two OH groups in phosphonic acid. It is a phosphorus oxoanion and a monovalent inorganic anion. It is a conjugate base of a phosphonic acid. It is a conjugate acid of a phosphonate(2-).
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