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Zinc bromide (Zn Br 2) is an inorganic compound with the chemical formula Zn Br 2. It is a colourless salt that shares many properties with zinc chloride (ZnCl 2 ), namely a high solubility in water forming acidic solutions, and good solubility in organic solvents.
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] Ammonium cyanide – [NH 4]CN [41] Ammonium dichromate – [NH 4] 2 Cr 2 O 7 [42 ...
Substance Formula 0 °C 10 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70 °C 80 °C 90 °C 100 °C Barium acetate: Ba(C 2 H 3 O 2) 2: 58.8: 62: 72: 75: 78.5: 77: 75
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
The key zinc-intermediate formed is a carbenoid (iodomethyl)zinc iodide which reacts with alkenes to afford the cyclopropanated product. The rate of forming the active zinc species is increased via ultrasonication since the initial reaction occurs at the surface of the metal.
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Related is the reaction of mercury(II) chloride with ammonia (Calomel reaction), where the resulting mercuric amidochloride is highly insoluble. HgCl 2 + 2 NH 3 → HgCl(NH 2) + [NH 4]Cl. The ammine ligands are more acidic than is ammonia (pK a ~ 33). For highly cationic complexes such as [Pt(NH 3) 6] 4+, the conjugate base can be obtained.
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