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NiCO 3 → NiO + CO 2. The nature of the resulting oxide depends on the nature of the precursor. The oxide obtained from the basic carbonate is often most useful for catalysis. Basic nickel carbonate can be made by treating solutions of nickel sulfate with sodium carbonate: 4 Ni 2+ + CO 2− 3 + 6 OH − + 4 H 2 O → Ni 4 CO 3 (OH) 6 (H 2 O) 4
Although most compounds are referred to by their IUPAC systematic names ... Nickel(II) hydroxide – Ni(OH) 2; Nickel(II) nitrate – Ni(NO 3) 2;
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]
This table lists only the occurrences in compounds and complexes, not pure elements in their standard state or allotropes. Noble gas +1 Bold values are main oxidation states
N. Neodymium nickelate; Nickel aluminide; Nickel arsenide; Nickel boride catalyst; Nickel dicyanide; Nickel double salts; Nickel formate; Nickel hydrazine nitrate
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 names "caffeine" and "3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione" both signify the same chemical compound.The systematic name encodes the structure and composition of the caffeine molecule in some detail, and provides an unambiguous reference to this compound, whereas the name "caffeine" simply names it.
Because the S 2− anion has a subscript of 2 in the formula (giving a 4− charge), the compound must be balanced with a 4+ charge on the Pb cation (lead can form cations with a 4+ or a 2+ charge). Thus, the compound is made of one Pb 4+ cation to every two S 2− anions, the compound is balanced, and its name is written as lead(IV) sulfide.