Nitrates and Nitrites with FeSO4 + CH3COOH


by Knightycloud
Tags: brown_ring_test, nitrate, nitrite
Knightycloud
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#1
Jun9-12, 08:56 AM
P: 86
1. The problem statement, all variables and given/known data
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???


2. Relevant equations
NO2-(aq) + FeSO4(aq) + CH3COOH(aq)[itex]\Rightarrow[/itex] [A Brown Circle]???
or is this equation invalid???


3. The attempt at a solution
Nothing being attempted!!! :(
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Borek
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#2
Jun9-12, 09:17 AM
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NO2- or NO3-, you are inconsistent.

If NO3- try to find out what is the reaction involved.
Knightycloud
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#3
Jun9-12, 09:23 AM
P: 86
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
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#4
Jun9-12, 11:03 AM
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Nitrates and Nitrites with FeSO4 + CH3COOH


I find it rather unlikely. While NO2- can interfere, test in general requires concentrated sulfuric acid, I doubt acetic acid is strong enough.
Knightycloud
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#5
Jun9-12, 10:27 PM
P: 86
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
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#6
Jun10-12, 02:34 AM
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That's what I expect, but I have learned long to not assume everything I expect is true.


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