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Nickel(II) carbonate describes one or a mixture of inorganic compounds containing nickel and carbonate. From the industrial perspective, an important nickel carbonate is basic nickel carbonate with the formula Ni 4 CO 3 (OH) 6 (H 2 O) 4 .
The known salts include (NH 4) 2 Ni 2 (SO 4) 3, K 2 Ni 2 (SO 4) 3 and Rb 2 Ni 2 (SO 4) 3, and those of Tl and Cs are predicted to exist. Some minerals are double salts, for example Nickelzippeite Ni 2 (UO 2) 6 (SO 4) 3 (OH) 10 · 16H 2 O which is isomorphic to cobaltzippeite, magnesiozippeite and zinczippeite, part of the zippeite group. [43]
Gaspéite, a very rare nickel carbonate mineral, with the formula (Ni,Fe,Mg)CO 3, is named for the place it was first described, in the Gaspé Peninsula, Québec, Canada. Gaspéite is the nickel rich member of the calcite group.
The compound can be prepared by treating nickel or nickel(II) carbonate with acetic acid: . NiCO 3 + 2 CH 3 CO 2 H + 3 H 2 O → Ni(CH 3 CO 2) 2 ·4 H 2 O + CO 2. The mint-green tetrahydrate has been shown by X-ray crystallography to adopt an octahedral structure, the central nickel centre being coordinated by four water molecules and two acetate ligands. [5]
Nickel trifluoroacetate tetrahydrate exists, as well as two emerald green acid trifluoroacetates, a bridged trinuclear form [Ni 3 (CF 3 COO) 6 (CF 3 COOH) 6](CF 3 COOH) and a hydrated acid form [Ni 3 (CF 3 COO) 6 (CF 3 COOH) 2 (H 2 O) 4](CF 3 COOH) 2 both with triclinic crystal form. The first has density 2.205 and the second 2.124.
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.
In the NO − 3 anion, the oxidation state of the central nitrogen atom is V (+5). This corresponds to the highest possible oxidation number of nitrogen. Nitrate is a potentially powerful oxidizer as evidenced by its explosive behaviour at high temperature when it is detonated in ammonium nitrate (NH 4 NO 3), or black powder, ignited by the shock wave of a primary explosive.
Cobalt(II) nitrate exists in the anhydrous form and the hydrate form, of which the hexahydrate is the most common. Cobalt nitrate hexahydrate (Co(NO 3) 2 ·6H 2 O) is a red deliquescence crystal that is easily soluble in water, [12] and its molecule contains cobalt(II) hydrated ions ([Co(H 2 O) 6] 2+) and free nitrate ions. [13]