Image: DSC01968 - Fe (II) Reactions

Description: 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.)
Title: DSC01968 - Fe (II) Reactions
Credit: Own work
Author: Tubifex
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