Preparation and Reactions
It forms upon union of the elements, but a more commonly used method involves heating a mixture of lanthanum(III) oxide and ammonium chloride at 200-250 °C:
- La2O3 + 6 NH4Cl → 2 LaCl3 + 6 NH3 + 2 H2O
From the trichloride, one can produce the other trihalides by exchange. Reduction with potassium gives metallic lanthanum.
Read more about this topic: Lanthanum(III) Chloride
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