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Image: DSC01973 - Nickel (II) reactions

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Description: Reactions of Nickel(II)-nitrate. From left to right: Pure solution of Nickel(II)-nitrate. You still can see the green color. With (NH4)2S: Ni2+ + S2- -> NiS(s) (The black precipitation is first soluble in acid. After corrosion with air oxygen over Ni(OH)S to Ni2S3, the end product is persistent to acid.) With NaOH: Ni2+ + 2OH- -> Ni(OH)2(s). (Beautiful light green huge flakes. Hardly soluble in OH- surplus.) With NH3: Ni(NO3)2 + 2OH- + 2NH4+ -> Ni(OH)2 + 2NaNO3 Ni(OH)2 + 6NH3 -> [Ni(NH3)6]2+ + 2OH- (The hydroxide dissolves to the blue complex solution very quickly.) With Na2CO3: Ni2+ + CO2- -> green alkaline Carbonate salts of varying composition.
Title: DSC01973 - Nickel (II) reactions
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Author: Tubifex
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