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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Cesium tetrafluoroaluminate demonstrates a time-functional solubility in acid and native solution. After one day stirring a mostly stable solution is found with solubility around 13 g ±1 g/l.

Key value for chemical safety assessment

Water solubility:
13 g/L
at the temperature of:
20 °C

Additional information

The water solubility of cesium tetrafluoroaluminate was determined in an in-house non-GLP non-guideline study. Despite some limitations in design and/or reporting, the study is considered adequate for assessment. Cesium tetrafluoroaluminate demonstrates a spontaneous solubility of 38.2 g/l (without pH adjustment). From the solution cesium tetrafluoroaluminate dihydrate is further on crystallized or precipitated. After one day stirring a mostly stable solution is found with solubility around 13 ±1 g/l. The pH of the unadjusted solution varies between 5.6 and 6.1. lt is assumed that without pH adjustment cesium tetrafluoroaluminate will dissociate into the ions Cs+ and AlF4-, eventually partly into Al+, Cs+ and F-. With pH adjustment to pH 7 and pH 9 a gel-like residue is formed, which could not be filtrated. At pH 4 and two days of stirring a solubility of 13.1 g/l was determined.