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Reaction between HNO3 and ferrous sulfate

August 1, 2008

I have a question about the reaction of HNO3 and ferrous sulfate. what is the reaction. we have a green sample of acid in our plant what do you think about the colour.
thanks for your attention

Asiehe sSdghi
- Mohshahr, Iran

August 1, 2008

My handbook only lists three iron compounds as being green and they are salts that include ammonia or cyanide or fluoride.
Sounds like you have some copper in the solution.

James Watts
- Navarre, Florida

August 6, 2008

When you mix a little FeSO4 in HNO3 you get a nice light lime green color. 5% FeSO4 w/v gives this amount, more will turn brown and ferric ammonium sulfate will turn purplish.

Jason Rothman
Chemist - Pomona, California, USA

August 7, 2008

Hi Jason,
Do you have a guess as to what that compound might be that causes the lime green color?
Jim, another chemist (retired)

James Watts
- Navarre, Florida

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