kevinlimse
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Registered: 12-9-2004
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Test for NO2
4 M of NO2 is liberated after heating a NO3- compound. Anyone knows how to test and identify the Gas NO2?
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frogfot
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By its color 
Letting it through water to make colorless NO, and then letting it out into air to reoxidise brown NO2. Not many gases can do that...
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Esplosivo
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There are various tests you can carry out to identify NO2 gas or its ions.
- NO2 gas decolourizes Potassium Manganate (VII)
- If aqueous iron (II) sulphate in dilute sulphuric acid is mixed with a nitrite salt a dark brown complex ion is formed - Fe(NO)2+
- Nitric (III) acid, forme by bubbling NO2 through water appears as a pale blue solution, decomposing to give brown fumes of NO2
Hope this helps
Theory guides, experiment decides.
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