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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

dissociation constant
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance has no ionic structure

Description of key information

The study does not need to be conducted. Butyl benzoate is an ester of benzoic acid. It is neither an acid or a base, it is an ester. Upon hydrolysis of the ester that is butyl benzoate, the hydrolysis products will be butanol (an alcohol) and benzoic acid (an organic acid). Benzoic acid has a pKa or acid dissociation constant of 4.2 (Source: however that is not the requested endpoint in this case.
Definition: An acid dissociation constant (Ka) is a quantitative measure of the strength of an acid in solution.

Key value for chemical safety assessment

Additional information