Methanephosphonic acid

Description

Methanephosphonic acid · CAS 993-13-5 · CH5O3P. UNII 329W4YM10Z. Melting Point: 108.5 °C; Vapor Pressure: 0.000002 [mmHg]; Dissociation Constants: pKa1= 2.12; pKa2= 7.29.

Identification

CAS Registry Number	993-13-5
PubChem CID	13818
Molecular formula	CH5O3P
IUPAC name	methylphosphonic acid
UNII (FDA)	329W4YM10Z

Computed Descriptors

Molecular Weight	96.022
XLogP3	-1.6
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	0
Exact Mass	95.99763101
Monoisotopic Mass	95.99763101
Topological Polar Surface Area	57.5
Heavy Atom Count	5
Formal Charge	0

Physical & Chemical Properties

Melting Point	108.5 °C
Vapor Pressure	0.000002 [mmHg]
Dissociation Constants	pKa1= 2.12; pKa2= 7.29

Physical description & handling notes

• Liquid
• White solid; [HSDB] White flakes or crystalline solid; [MSDSonline]
• White solid
• Decomposes
• Soluble in ethanol and ethyl ether; insoluble in benzene
• In water, >20,000 mg/l (no temperature reported)

GHS Hazard Classification

Reported hazard statements	H302 (91.9%), H314 (100%), H318 (47.7%)

Documented Uses

• Breakdown product of the nerve agents sarin, soman, and VX; Used in the production of lubricant additives, to treat textiles, and to simulate chemical warfare agents; [HSDB]
• Textiles (Fiber & Fabric Manufacturing) [Category: Industry]
• Used in the production of lubricant additives and for treating textiles.
• Synthetic Dye and Pigment Manufacturing
• Textiles, apparel, and leather manufacturing
• Phosphonic acid, P-methyl-: ACTIVE

Synonyms

Methylphosphonic acid; 993-13-5; Methanephosphonic acid; Phosphonic acid, methyl-; METHYL PHOSPHONIC ACID; 329W4YM10Z; NSC-119358; DTXSID5047748; CHEBI:45129; RefChem:818680; DTXCID9027732; 213-607-2; p-methylphosphonic acid; Phosphonic acid, P-methyl-; MFCD00002137; CHEMBL122938

Frequently Asked Questions

What are the CAS number and molecular formula of Methanephosphonic acid?

CAS 993-13-5; molecular formula CH5O3P; molecular weight — g/mol.

What other names is Methanephosphonic acid known by?

Methylphosphonic acid, 993-13-5, Methanephosphonic acid, Phosphonic acid, methyl-, METHYL PHOSPHONIC ACID, 329W4YM10Z.

Is Methanephosphonic acid classified as hazardous?

Hazard statements reported: H302, H314, H318.

What are the key physical properties of Methanephosphonic acid?

Melting Point: 108.5 °C; Vapor Pressure: 0.000002 [mmHg]; Dissociation Constants: pKa1= 2.12; pKa2= 7.29.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.