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Nickel Carbonate, NiCO3

When solutions of nickel salts are treated with potassium or sodium carbonate, basic Nickel Carbonate, NiCO3 are precipitated, their compositions varying according to circumstances. The normal hexahydrated carbonate, NiCO3. 6H2O, is obtained when a solution of sodium hydrogen carbonate saturated with carbon dioxide is added to one of nickel nitrate and allowed to stand at a low temperature. It separates in monoclinic crystals, which lose water on warming. The trihydrate, NiCO3.3H2O, is also known. The anhydrous salt results when nickel chloride solution is heated with calcium carbonate to 150° C. It crystallises in pale green rhombohedra. Double carbonates have been prepared.
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