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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 231-595-7 | CAS number: 7647-01-0
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
A JUSTIFICATION FOR NON-SUBMISSION OF DATA
Key value for chemical safety assessment
Additional information
The active substance, hydrochloric acid, is used as an aqueous solution (33-36%). Hydrochloric acid is a strong acid that is very soluble in water and dissociates completely (Cl- is a very weak conjugate base, therefore the reaction goes to completion), to form chloride ion and hydronium ions.
HCl
+ H2O --> H3O+ + Cl-
As a result of the complete dissociation of HCl in water, the concentration of the resultant hydronium ions is equal to the concentration of the HCl introduced to the solution and for the purpose of calculating the resultant pH the reaction may be written as:
HCl
(aq) --> H+ + Cl-
pH is
calculated as -log10[H+], where the units of hydrogen ion concentration
are moles/litre (molarity).
As hydrochloric acid dissociates in water, effects are due to hydronium
and chloride ion concentrations and the major result of dissolution of
HCl in water is the resulting pH.
Thus, due to these intrinsic properties, it is scientifically impossible
to perform the hydrolysis test. In addition, since the behaviour of HCl
in water is known, it is also not scientifically necessary to perform a
hydrolysis test.
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.
