Registration Dossier
Registration Dossier
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EC number: 233-237-5 | CAS number: 10099-58-8
Endpoint summary
Administrative data
Description of key information
Additional information
Lanthanum chloride is an inorganic salt of a weak base, therefore when it is transferred into the aquatic environment (pH usually in a range of 4-9), salt hydrolysis may proceed.
La3++ 3Cl-+ H2O → La(OH)2++ H++ 3 Cl-
La(OH)2++ H2O → La(OH)+2+ H+
La(OH)+2+ H2O → La(OH)3↓ + H+
For Lanthanum chloride, salt hydrolysis tends to increase with increasing pH, as then a precipitation of Lanthanum hydroxide starts (a saturated solution of Lanthanum hydroxide in water at 25 °C has a pH of 9.0). The salt hydrolysis can be suppressed by strong acidic condition (pH < 3), because the solution of Lanthanum chloride in water is noticeably acidic (pH approx. 2.5). Therefore, at pH values of the solution below 3, Lanthanum chloride exists in water only as ions since under this condition it dissociates completely or nearly completely. At pH values of the solution above 3, salt hydrolysis can occur. Finally, at pH values of the solution above 9, only Lanthanum hydroxide exists.
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