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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 of lithium hydroxide anhydrous is between 13.8 and 14.18 at 20°C. For lithium hydroxide monohydrate also full dissociation is very likely, whereas the pH value of a solution of comparable morality is expected to be lower, due to the content of crystal water (less hydroxyl ions).

Key value for chemical safety assessment

pKa at 20°C:
14

Additional information

Lithium hydroxide is usually considered to be a strong base, almost completely dissociated in aqueous solution. Based on the available data the pKa of lithium hydroxide anhydrous is between 13.8 and 14.18 at 20°C. This result demonstrates the extreme alkaline character of lithium hydroxide anhydrous in aqueous solutions. For lithium hydroxide monohydrate also full dissociation is very likely, whereas the pH value of a solution of comparable morality is expected to be lower, due to the content of crystal water (less hydroxyl ions).