File:DSC01971 - Cobalt (II) reactions.JPG

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English: Reactions with Cobalt (II) nitrate. From left to right:

Pure solution of Cobalt (II) nitrate. It is a very pale pink solution.

With (NH4)2S: Co2+ + S2- -> CoS(s) (The black solid is first soluble in acid, but will react over Co(OH)S to Co2S3 when on air. This product is persistent to acid.)

With NaOH: Co2+ + OH- -> (in cold:) blue alkaline salts of varying composition; (in hot or in NaOH surplus:) Co(OH)2 (rose red to brownish; this is the more stable form)

With Na2CO3: Co2+ + (CO3)2- -> blue carbonate salts of varying composition (Will become that brown Co(OH)2 in surplus, too.)
Deutsch: Reaktionen mit Cobalt(II)-Nitrate. Von links nach rechts:

Reine Lösung des Cobalt(II)-Nitrat. Die Lösung ist sehr schwach rosa.

Mit (NH4)2S: Co2+ + S2- -> CoS(s) (Der schwarze Niederschlag ist frisch gefällt löslich in Säure, reagiert an der Luft aber weiter über Co(OH)S zu Co2S3. Das Endprodukt ist dann säurebeständig.)

Mit NaOH: Co2+ + OH- -> (in der Kälte:) blaue alkalische Salze wechselnder Zusammensetzung; (in der Hitze oder im NaOH-Überschuss:) Co(OH)2 (rosarot bis braun, dies ist die stabilere der beiden Formen.)

Mit Na2CO3: Co2+ + (CO3)2- -> blaue Carbonate wechselnder Zusammensetzung (Im Überschuss wird man auch hier Co(OH)2 erhalten.)
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Author Tubifex

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current17:03, 21 December 2009Thumbnail for version as of 17:03, 21 December 2009952 × 1,536 (441 KB)Tubifex (talk | contribs){{Information |Description={{en|1=Reactions with Cobalt (II) nitrate. From left to right: Pure solution of Cobalt (II) nitrate. It is a very pale pink solution. With (NH4)2S: Co2+ + S2- -> CoS(s) (The black solid is first soluble in acid, but will react

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