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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Description of key information

The pKa for formaldehyde is determined to range from 12.79-13.27 at temperatures ranging from 23-30°C.

Key value for chemical safety assessment

Additional information

Three sources were identified concerning the dissociation constant of formaldehyde. According to the online database HSDB (2015) the pKa at 25 °C is 13.27. This value is supported by Reaxys wich reported a pKa of 12.79 at 23 °C (Wadano 1934) and a pKa of 12.87 at 30°C (Levy 1933).