Cacodylic Acid

Description

Cacodylic Acid · CAS 917-76-0 · C2H7AsO2. UNII AJ2HL7EU8K. Boiling Point: >200 °C; Melting Point: 383 to 385 °F (NTP, 1992); Melting Point: 195 °C.

Identification

CAS Registry Number	917-76-0
PubChem CID	2513
Molecular formula	C2H7AsO2
IUPAC name	dimethylarsinic acid
UNII (FDA)	AJ2HL7EU8K

Computed Descriptors

Molecular Weight	138.00
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	0
Exact Mass	137.966199
Monoisotopic Mass	137.966199
Topological Polar Surface Area	37.3
Heavy Atom Count	5
Formal Charge	0
Complexity	62

Physical & Chemical Properties

Boiling Point	>200 °C
Melting Point	383 to 385 °F (NTP, 1992)
Melting Point	195 °C
Solubility	In water, 2X10+6 mg/l @ 25 °C.
Vapor Pressure	0.0000001 [mmHg]
Dissociation Constants	pKa = 1.57

Physical description & handling notes

• Cacodylic acid appears as a colorless, odorless crystalline solid. Melting point 195-196 °C. Toxic by ingestion and irritating to skin and eyes.
• Hygroscopic solid; [Merck Index] Colorless odorless hygroscopic solid; [CAMEO] White crystalline solid; [MSDSonline]
• Solid
• Crystals from alcohol and ether
• Colorless
• TRICLINIC CRYSTALS

GHS Hazard Classification

Reported hazard statements	H301 (94.2%), H331 (94.2%), H400 (90.4%), H410 (98.1%)

Documented Uses

• Used as a herbicide; [Sullivan, p. 981] Used as a drug (dermatological and veterinarian); [Merck Index] Used as a preharvest desiccant, a soil sterilant, a chemical warfare agent, a timber thinning defoliant, and a sugarcane ripener; [HSDB] Used as a defoliant and herbicide registered to control weeds under non-bearing citrus trees, around buildings, and for lawn renovation; [Reference #1]
• Herbicide; soil sterilant; chemical warfare; timber thinning.
• Cacodylic acid is a contact herbicide which defoliates or desiccates a large variety of plants.
• For more Uses (Complete) data for DIMETHYLARSENIC ACID (10 total), please visit the HSDB record page.
• Sodium dimethylarsinate is used as a drug in veterinary medicine to treat anaemia and eczema, and is also an herbicide.
• Information on 2 consumer products that contain Dimethylarsinic acid in the following categories is provided:

Synonyms

cacodylic acid; Dimethylarsinic acid; 75-60-5; Silvisar; Phytar; Arsan; DIMETHYLARSENIC ACID; Erase; Ansar 138; Silvisar 510; Arsinic acid, dimethyl-; Phytar 560; Moncide; Sylvicor; Dilic; Agent Blue

Frequently Asked Questions

What are the CAS number and molecular formula of Cacodylic Acid?

CAS 917-76-0; molecular formula C2H7AsO2; molecular weight — g/mol.

What other names is Cacodylic Acid known by?

cacodylic acid, Dimethylarsinic acid, 75-60-5, Silvisar, Phytar, Arsan.

Is Cacodylic Acid classified as hazardous?

Hazard statements reported: H301, H331, H400, H410.

What are the key physical properties of Cacodylic Acid?

Boiling Point: >200 °C; Melting Point: 383 to 385 °F (NTP, 1992); Melting Point: 195 °C; Solubility: In water, 2X10+6 mg/l @ 25 °C..

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.