Nitrates and Nitrites with FeSO4 + CH3COOH

[Knightycloud]

Homework Statement

I know that NO₃^- can be separately identify using newly made FeSO₄ + H₂SO₄ using the brown ring test.
The problem is can we identify NO₂^- using newly made FeSO₄ + CH₃COOH? Replacing H₂SO₄ with CH₃COOH?

Homework Equations

NO₂^-_(aq) + FeSO_4(aq) + CH₃COOH_(aq)$\Rightarrow$ [A Brown Circle]?
or is this equation invalid?

The Attempt at a Solution

Nothing being attempted! :(

 

[Borek]

NO₂^- or NO₃^-, you are inconsistent.

If NO₃^- try to find out what is the reaction involved.

 

[Knightycloud]

Its NO2- is the problem. I've never learn such a reaction using Acetic acid to identify NO2- and a paper says you can't but I got it from a friend who says that using Acetic acid can identify NO2-.

 

[Borek]

I find it rather unlikely. While NO₂^- can interfere, test in general requires concentrated sulfuric acid, I doubt acetic acid is strong enough.

 

[Knightycloud]

Yeah, I believe it too. So may I have the final conclusion as Acetic acid does nothing regarding detection of NO₂^-? I've never heard such a test too!

 

[Borek]

That's what I expect, but I have learned long to not assume everything I expect is true.