File:DSC01968 - Fe (II) Reactions.JPG
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Summary
| Description |
English: Reactions of Ammonium iron(II) sulfate (Mohr's Salt). From left to right:
With (NH4)2S: S2- + Fe2+ -> FeS(s) (black solid) With NaOH: Fe2+ + 2OH- -> Fe(OH)2(s) (this is a white salt, but because of minimum Fe(III) amounts it often comes with a slightly green touch; this is what happened here. Because of the air oxygen the salt above reacts to brown Fe(OH)3) With surplus NH3: Fe2+ + 6NH3 -> [Fe(NH3)6]2+ (probably with some nitroso-pentamine-salts and oxygen products. On the surface you can see the reaction with air oxygen again. To have a proper reaction, the reaction is to be made completely without oxygen!) With Na2CO3: Fe2+ + (CO3)2- -> FeCO3(s) (This is a white solid! But because of side reactions with oxygen and Fe(III), here it comes in a green suspension.)Deutsch: Reaktionen mit Ammonium-Eisen(II)-Sulfat (Mohrsches Salz). Von links nach rechts:
Mit (NH4)2S: S2- + Fe2+ -> FeS(s) (schwarzer Niederschlag) Mit NaOH: Fe2+ + 2OH- -> Fe(OH)2(s) (Dies ist ein weißes Salz, aber durch minimale Fe(III)-Verunreinigungen erhält man es meistens mit einem Grünstich; dies war auch hier der Fall. Durch den Luftsauerstoff reagiert das Hydroxid an der Oberfläche weiter Fe(OH)3.) Mit NH3 im Überschuss: Fe2+ + 6NH3 -> [Fe(NH3)6]2+ (Vermutlich mit einigen Nitroso-Pentammin-Salzen und Oxidationsprodukten durch den Luftsauerstoff, dessen Wirkung auch hier wieder an der Oberfläche sichtbar ist. Um eine saubere Reaktion zu [Fe(NH)6]2+ zu erhalten, muss komplett unter Luftabschluss gearbeitet werden!) Mit Na2CO3: Fe2+ + (CO3)2- -> FeCO3(s) (Dies ist ein weißer Feststoff! Aber aufgrund Nebenreaktionen mit Sauerstoff und Fe(III) liegt es hier in einer grünen Suspension vor.) |
| Date | |
| Source | Own work |
| Author | Tubifex |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:20, 21 December 2009 | | 1,074 × 1,931 (580 KB) | Tubifex | {{Information |Description={{en|1=Reactions of Ammonium iron(II) sulfate (Mohr's Salt). From left to right: With (NH4)2S: S2- + Fe2+ -> FeS(s) (black solid) With NaOH: Fe2+ + 2OH- -> Fe(OH)2(s) (this is a white salt, but because of minimum Fe(III) amou |
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