Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Description of key information

Weight of evidence approach based on two peer-reviewed values from handbooks (pKa = -1 and approx 0) and one calculated value (pKa = -1.3)

Key value for chemical safety assessment

Additional information

Nitric acid is considered a stong acid, its pKa being outside the pH range considered relevant for the environment. Although the temperature of measurements was not reported, the values are anticipated to refer to ambient temperature. The pKa is provided as a rounded-up mean value.

Value used for CSA: pKa = -1