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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Water solubility

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Administrative data

Link to relevant study record(s)

Description of key information

Weight of evidence approach:
- Merck (2006): the water solubility is 90 parts in 100 parts water at 0 °C and 400 parts in 100 parts water at 90 °C
- CRC (2008): selenous acid is very soluble
Supportive data:
- GESTIS (2009): the water solubility is 1670 g/L

Key value for chemical safety assessment

Additional information

According to handbook data (Merck index and CRC handbook) selenous acid is very soluble in water. Handbook data considered to be from a trusted source acc. to "ECHA, Guidance on information requirements and chemical safety assessment – Chapter R.7a: Endpoint specific guidance". The statements in these two handbooks are supported by the entry in the "GESTIS-database on hazardous substances".