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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: zokora on February 06, 2014, 08:15:14 AM

Title: Which reactions could happen?
Post by: zokora on February 06, 2014, 08:15:14 AM

Dear all,

I mixed 2 solutions: FeCl2 (light green) and NaHSO3. It appears orange yellow color immediately. Then I had left the solution for 1 day, the red yellow color returned light green (like FeCl2).
I was wondering whether Fe(II) combine with HSO3 to become complexes? Thanks in advance.
Sorry for my bad English

Title: Re: Which reactions could happen?
Post by: zokora on February 12, 2014, 08:50:23 AM

Anybody?

Title: Re: Which reactions could happen?
Post by: Corribus on February 12, 2014, 09:42:16 AM

Well, ferrous salts are generally green in solution and ferric salts tend to be yellow-brown. Bisulfite is a reducing agent that will slowly react with dissolved oxygen to form sulfate.

Does this give you any clues to what may be happening?

Title: Re: Which reactions could happen?
Post by: zokora on February 24, 2014, 05:25:31 AM

Thanks Corribus,

I also thought about that possibility. But I didnt see any precitipation, just the yellow-brown solution. Additionally, the solution turned to the initial color (light green) after 1 day.