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Aqueous solutions of nickel sulfate react with sodium carbonate to precipitate nickel carbonate, a precursor to nickel-based catalysts and pigments. [6] Addition of ammonium sulfate to concentrated aqueous solutions of nickel sulfate precipitates Ni(NH 4) 2 (SO 4) 2 ·6H 2 O. This blue-coloured solid is analogous to Mohr's salt, Fe(NH 4) 2 (SO ...
Basic nickel carbonate, zaratite, with the formula Ni 4 CO 3 (OH) 6 (H 2 O) 4, is produced when alkali carbonates are added to a nickel solution. Nickel phosphate, Ni 3 (PO 4) 2 · 7 H 2 O is also insoluble. [1] A number of other phosphates have been made, including nanoporous substances resembling zeolites named with "Versailles Santa Barbara ...
One commercial method for extraction of nickel from its sulfide ores involves the sulfate salt of [Ni(NH 3) 6] 2+. In this process, the partially purified ore is treated with air and ammonia as described with this simplified equation: [3] NiS + 2 O 2 + 6 NH 3 → [Ni(NH 3) 6]SO 4
As a mineral the ammonium nickel salt, (NH 4) 2 Ni(SO 4) 2 · 6 H 2 O, can be called nickelboussingaultite. [2] With sodium, the double sulfate is nickelblödite Na 2 Ni(SO 4) 2 · 4 H 2 O from the blödite family. Nickel can be substituted by other divalent metals of similar sized to make mixtures that crystallise in the same form. [3]
The first periodatonickalates discovered were sodium nickel periodate (NaNiIO 6 ·0.5H 2 O) and potassium nickel periodate (KNiIO 6 ·0.5H 2 O). P. Ray and B. Sarma obtained these dark purple double salts in 1949, mixing nickel sulfate with potassium or sodium periodate and (as oxidant) a boiling aqueous solution of an alkali persulfate ...
It can be made by oxidising nickel nitrate in a cold alkaline solution with bromine. A mixed oxidation state hydroxide Ni 3 O 2 (OH) 4 is made if oxidation happens in a hot alkaline solution. A Ni 4+ hydroxide: nickel peroxide hydrate NiO 2 · H 2 O, can be made by oxidising with alkaline peroxide. It is black, and unstable and oxidises water.
Nickel(II) thiocyanate can be prepared via the reaction of barium thiocyanate and nickel sulfate solutions. After removal of the precipitated barium sulfate]], the solution is allowed to evaporate leaving microcrystalline Ni(SCN) 2. [3] [4]
Nickel maleate can be made from maleic acid and nickel carbonate in boiling water. A dihydrate crystallises from the water solution. [11] Nickel fumarate prepared from fumaric acid and nickel carbonate is pale green as a tetrahydrate, and mustard coloured as an anhydride. It decomposes when heated to 300° to 340° in vacuum.