| | Chemical Properties | Back Directory |  | [Appearance] 
 Colorless crystals, decomposes and reddens on exposure to air.Soluble in water; slightly soluble in alcohol.
 |  | [InChIKey] 
 NCVPALHKTOMDIO-UHFFFAOYSA-N
 |  | [SMILES] 
 N1C2=CC=C3C(=C2C2=C4C(C=CC=C4)=CC=C2NC=1C1NC2=CC=C4C(=C2C2=C5C(C=CC=C5)=CC=C2N=1)C=CC=C4)C=CC=C3
 |  | [Uses] 
 Preparation of other iodides.
 |  | [CAS DataBase Reference] 
 13718-00-8
 | 
 | Hazard Information | Back Directory |  | [Chemical Properties] 
 Colorless crystals, decomposes and reddens on exposure to air.Soluble in water; slightly soluble in alcohol.
 |  | [Physical properties] 
 Barium iodide occurs in two forms, one anhydrous
and the other as a dihydrate. Both are white solids. This salt is stable, but air and light sensitive. It is also
hygroscopic and moisture sensitive. Barium iodide is
incompatible with strong oxidizing agents.
 |  | [Preparation] 
 Barium
iodide is made by the neutralization of barium
carbonate with HI in water:
 BaCO3+2HI (aq)→BaI2 (aq)
 It is also made by the reaction of BaH2 with ammonium
iodide in pyridine:
 BaH2+2NH4I (aq)→BaI2 (aq)+ 2NH3 (gas)+H2 (gas)
 The product crystallizes as the hydrate BaI2·2H2O. If
this heated, dehydration to anhydrous BaI2 occurs. The
dihydrate dehydrates at 539°C to form BaI2.
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