|
|Section2= |Section3= |Section4= |Section7= }} Cobalt(II) carbonate is the inorganic compound with the formula CoCO3. This reddish paramagnetic solid is an intermediate in the hydrometallurgical purification of cobalt from its ores. It is an inorganic pigment, and a precursor to catalysts.〔John Dallas Donaldson, Detmar Beyersmann, "Cobalt and Cobalt Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005. 〕 Commercially available pale violet basic cobalt carbonate, with the formula CoCO3(Co(OH)x(H2O)y (CAS 12069-68-0).〔Cobalt(II) carbonate also occurs as the rare mineral spherocobaltite, which occurs as pink/red trigonal crystals with a specific gravity of 4.13g/cm3(Spherocobaltite ) ''www.mindat.org''〕 ==Preparation and properties== It is prepared by heating cobaltous sulfate with a solution of sodium bicarbonate. Heating the carbonate, i.e. calcining, proceeds in the usual way: : 3 CoCO3 + 1/2 O2 → Co3O4 + 3 CO2 The resulting Co3O4 converts reversibly to CoO at high temperatures.〔G.A. El-Shobaky, A.S. Ahmad, A.N. Al-Noaimi and H.G. El-Shobaky Journal of Thermal Analysis and Calorimetry 1996, Volume 46, Number 6 , pp.1801-1808. (online abstract )〕 Like most transition metal carbonates, cobalt carbonate is insoluble in water but is readily attacked by mineral acids: :CoCO3 + 2 HCl + 5 H2O → ()Cl2 + CO2 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cobalt(II) carbonate」の詳細全文を読む スポンサード リンク
|