Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The experimental pKa value for 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs. was found to be 0.000000000001744, 0.00000000000175, and 0.00000000000174 at 30°C indicating that the substance has dissociation properties.The average pKa value at 20°C is equivalent to 0.0000000000011631

Key value for chemical safety assessment

pKa at 20°C:
0

Additional information

The experimental pKa value for 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs. was found to be 0.000000000001744, 0.00000000000175, and 0.00000000000174 at 30°C indicating that the substance has dissociation properties.The average pKa value at 20°C is equivalent to 0.0000000000011631