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Lanthanum acetate, 2La(C2H3O2)3

Lanthanum acetate, 2La(C2H3O2)3.3H2O, crystallises from its aqueous solution in thin prisms.

When a cold aqueous solution of lanthanum acetate is made ammoniacal, a colloidal basic acetate is precipitated; if a little solid iodine be added to the precipitate a blue adsorption compound is produced, similar in appearance to the familiar "starch-iodide" precipitate. The blue substance may conveniently be prepared by adding a solution of iodine in potassium iodide to a cold solution of lanthanum acetate (or nitrate acidified with acetic acid), adding ammonia cautiously until very little iodine is left unchanged, and then warming the mixture very gently.

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