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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Vapour pressure

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Description of key information

The calculated vapour pressure range is 2.6442 - 2.9340 kPa.

Key value for chemical safety assessment

Additional information

Vapour pressure of the substance was estimated by calculation according to Raoult's law. The calculation was based on the real amount of NaOH in the solution and on the assumption that the total amount of salts is as fully dissociated NaOH. These represent the minimum and the maximum vapour pressures. Thus, the calculated vapour pressure range is 2.6442 - 2.9340 kPa. However, the molalities of the salts in the solution are relatively high to make a reliable assessment by calculation.