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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.
This clock reaction uses sodium, potassium or ammonium persulfate to oxidize iodide ions to iodine. Sodium thiosulfate is used to reduce iodine back to iodide before the iodine can complex with the starch to form the characteristic blue-black color. Iodine is generated: 2 I − + S 2 O 2− 8 → I 2 + 2 SO 2− 4. And is then removed:
Ammonium is a modified form of ammonia that has an extra hydrogen atom. It is a positively charged molecular ion with the chemical formula NH + 4 or [NH 4] +.It is formed by the addition of a proton (a hydrogen nucleus) to ammonia (NH 3).
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 .
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 ...
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Ammonium bicarbonate – [NH 4]HCO 3 [35] Ammonium bisulfate – [NH 4]HSO 4 [36] Ammonium bromide – NH 4 Br [37] Ammonium chromate – [NH 4] 2 CrO 4 [38] Ammonium cerium(IV) nitrate – [NH 4] 2 [Ce(NO 3) 6] Ammonium cerium(IV) sulfate – [NH 4] 4 [Ce(SO 4) 4] Ammonium chloride – [NH 4]Cl [39] Ammonium chlorate – [NH 4]ClO 3 [40 ...