Nickel Sulfate NiSO

TABLE 2-63 Nickel Chloride (NiCI,) TABLE 2-64 Nickel Nitrate [Ni(N03),l TABLE 2-65 Nickel Sulfate (NiSO ) ... 

In this reaction, the nickel ions of the nickel sulfate (NiSO ) are exchanged for the calcium ions of the calcium hydroxide [Ca(OH)2 ] molecule. Similarly, a resin with hydrogen ions available for exchange will exchange those ions for nickel ions from solution. The reaction can be written as follows ... 

Nickel sulfate (NiSO ) exists in different states depending on its hydrated forms (where water molecules bond with ions in suspended substances). Nickel sulfate can be in the form of greenish-yellow, blue, or green crystals, depending upon the degree of hydration. It is used in nickel-plating iron and copper, as a catalyst, as a mordant in the textile industry, and as a coating for other substances. 

The hydrated salts of nickel such as nickel sulfate, NiSO GHgO. and nickel chloride, NiCU GHsO, are green in color. Nickelous hy droxide, Ni(OH)2, formed as an apple-green precipitate by addition of alkali to a solution containing nickelous ion. When heated it pro duces the insoluble green substance nickelous oxide, NiO. Nickelous hydroxide is soluble in ammonium hydroxide, forming ammonia com plexes such as Ni(NH3)4(HoO). + + and Ni(NHg)g+ +. ... 

Nickel [7440-02-0] Ni, recognized as an element as early as 1754 (1), was not isolated until 1820 (2). It was mined from arsenic sulfide mineral deposits (3) and first used in an alloy called German Silver (4). Soon after, nickel was used as an anode in solutions of nickel sulfate [7786-81 A] NiSO, and nickel chloride [7718-54-9] NiCl, to electroplate jewelry. Nickel carbonyl [13463-39-3] Ni(C02)4, was discovered in 1890 (see Carbonyls). This material, distilled as a hquid, decomposes into carbon monoxide and pure nickel powder, a method used in nickel refining (5) (see Nickel and nickel alloys). 

Properties. Nickel sulfate hexahydrate [10101 -97-0], NiSo 6H20 is a monoclinic emerald-green crystalline salt that dissolves easily in water and in ethanol. When heated, it loses water and above 800°C decomposes into nickel oxide and SO3. Its density is 2.03 g/cm. ... 

C. 5.47 X 10 formula units of nickel(II) sulfate, NiSO d. 7.66 X 10 molecules of hydrogen peroxide, H2O2... 

NiSO (NH 2 04-6H20, and nickel potassium sulfate [10294-65-2], NiSO -K2S04-6H20, are prepared by crystallizing the individual salts from a water solution. These have limited use as dye mordants and are used in metal-finishing compositions (59). 

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