Presentation of aluminium(III)-iodide

Chemicals needed

aluminium grits    GSLEICHT.gif (932 Byte) F   R 15-17    S (2)-7/8-43

iodine  GSGESUND.gif (476 Byte) Xn  GSUMWELT.gif (758 Byte)  N   R 20/21-50    S (2)-23-25-61

Equipment needed

test tube
test tube holder
burner (gas or alcohol)

Test procedure


The diluted residues can in the case of small quantities be discharged into the drainage. If one adds water to the cooled mixture a hissing noise results: the irreversible hydration of the anhydrous aluminium iodide is intensely exothermic (one compares the reaction of AlCl3).


This is a case of oxidation with flame phenomenon(combustion), whereby not oxygen but iodine serves as the oxidant. The reaction with oxygen should, in accordance with its oxidizing effects, be substantially more powerful, however aluminium (except in the finest of distributions) is difficult to ignite under air. This is due to the fact that the Al2O3 which is formed on the surface hinders the reaction. AlI3 on the other hand sublimates already at relatively low temperatures and supplies ever new aluminium metal for the reaction's progress.


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