Registration Dossier
Registration Dossier
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EC number: 237-537-7 | CAS number: 13827-02-6
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
KZnF3 completely dissociates to K-, Zn- and F-ions at pH4 and pH6. At pH9 hydrolysis is observed under formation of zinc -oxide, -hydroxide and -hydroxyfluoride precipitates. An approximate 39% hydrolysis is estimated to occur.
Key value for chemical safety assessment
- at the temperature of:
- 20 °C
Additional information
A hydrolysis test was performed as part of a solubility study at varying pH. Although the study was not performed according to GLP criteria or guideline, the results are considered adequate for assessment. In this study, the mol ratio of K-, Zn- and F-ions in solution under acidic and neutral conditions was close to the theoretical ratio of 1:1:3 indicating that full dissociation and no hydrolysis occurs. In alkaline environment, a large amount of fluoride ions was found in solution compared to dissolved zinc. This indicates that at pH 9 hydrolysis of KZnF3 occurs through exchange of fluoride against hydroxyl groups under precipitation of zinc -oxides, -hydroxides and -hydroxyfluorides. Based on the difference between solubility at pH 6 and pH 9, as a gross estimation, hydrolysis at pH 9 is approximately 39 %.
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