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Ammonium iodide is the inorganic compound with the formula NH 4 I. A white solid. It is an ionic compound, although impure samples appear yellow. This salt consists of ammonium cation and an iodide anion. [1] It can be prepared by the action of hydroiodic acid on ammonia. It is easily soluble in water, from which it crystallizes in cubes.
The enthalpy of formation Δ f H 0 of tetra-n-butylammonium iodide is −499 kJ/mol, which is lower than that for the bromide or chloride (−540, −564 kJ/mol). [2] At lower temperatures with water tetra-n-butylammonium iodide forms a clathrate hydrate. [2] The tetra-n-butylammonium cation is large and hydrophobic.
Ammonia or ammonium ion when added to Nessler's reagent gives a brown color precipitate known as the iodide of Million's base in basic medium. Ammonium ion when added to chloroplatinic acid gives a yellow precipitate of ammonium hexachloroplatinate(IV). H 2 [PtCl 6](aq) + [NH 4] + (aq) → [NH 4] 2 [PtCl 6](s) + 2 H +
Methylammonium iodide in an organic halide with a formula of CH 3 NH 3 I. It is an ammonium salt composed of methylamine and hydrogen iodide . The primary application for methylammonium iodide, sometimes in combination with other methylammonium halides , is as a component of perovskite (structure) crystalline solar cells .
Ammonium triiodide [1] [2] (NH 4 I 3) is the salt of the ammonium cation with the triiodide anion. Sometimes the name ammonium triiodide is mistakenly used to refer to a different compound, nitrogen triiodide (NI 3 ), or more precisely, the slightly more stable ammine , NI 3 · NH 3 .
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The low solubility of silver iodide and lead iodide reflects the covalent character of these metal iodides. A test for the presence of iodide ions is the formation of yellow precipitates of these compounds upon treatment of a solution of silver nitrate or lead(II) nitrate. [2] Aqueous solutions of iodide salts dissolve iodine better than pure ...