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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Titration curve of both Ca and hypophosphite ions.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

No dissociation constant was measured for hypophosphite ion. Calcium ion has got a pKa = 12.6, i.e. very alcaline.

This means that both ions are very stable in a large pH range. Only at very high pH minor precipitation of Ca(OH)2 may occur.

Dissolution of Calcium hypophosphite in water does not affect the pH of the solution.