Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 231-901-9 | CAS number: 7778-39-4
Endpoint summary
Administrative data
Description of key information
Additional information
There are no proprietary data on arsenic acid. Several sources of information provide data on physical and chemical properties of arsenic acid. Data are either originating from secondary sources with primary source not retrievable or from reference source with peer reviewed data. Where a key reliable value cannot be determined, a weight of evidence approach is used to determine a key value for the chemical safety assessment.
Arsenic acid (RN CAS 7774-39-4) is a weak acid that can exist either as a liquid form (solution) or a hygroscopic crystalline solid (arsenic acid hemihydrate). The boiling point of arsenic acid is 160°C which corresponds to loss of water. A key value of 18.45 hPa is determined for the vapour pressure of arsenic acid. In water, arsenic acid dissociates in water and exists as a mixture of arsenate ions.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
