[whizkidindia]

Hello, I was messing around with chemistry recently when this incident happened.
I kept some iron filings in clear vinegar and water overnight. The next morning the solution was very slightly tan coloured. Bubbles were on the filings. Since the room was smelling of vinegar, I decided to stop the experiment and rinsed away most of the liquids leaving the wet iron fillings behind. Just for fun, I decided to add some Magnesium Carbonate (that I had created by seperating and dehydrating the precipitate formed when Magnesium Sulphate and Sodium Carbonate react in solution form).  :oInterestingly , after a few minutes, the magnesium carbonate started turning deep green in color. Is there anyone on this planet who can tell me how the hell did that happen and the reaction behind it?

[billnotgatez]

Please write some possible formulas for the reactions.
Maybe start with the first one with iron filings and vinegar.
You can write the the acetic acid as
CH₃CO₂H

Also did you try using iron filing that did not get the vinegar treatment but was washed?
Why would we want to do that experiment I just mentioned.

I am answering based on how we do things in the forum.
Click on the link near the top center of the forum page.
Forum Rules: Read This Before Posting.
http://www.chemicalforums.com/index.php?topic=65859.0

[whizkidindia]

I tried using the untreated iron filings, and nothing happened. So its possibly because of the iron filings treated with vinegar and salt. Step one solved.

[billnotgatez]

I tried using the untreated iron filings, and nothing happened. So its possibly because of the iron filings treated with vinegar and salt. Step one solved.

Sounds good- just confirming - were the filings wet with just water used for rinsing?
 
Also can you write the formula I ask about?

[whizkidindia]

Recently, I left some iron filings in 60% Acetic Acid for twelve hours. The mixture appeared brownish black, probably due to iron oxide and dissolved iron particles.
Just to see what would happen, I added some 6% hydrogen peroxide to the mixture, and after a little stirring it gave very little effervescence and the mixture turned deep red. What could this new compound be? Could it be iron acetate?

[billnotgatez]

From WIKI

Vinegar is a liquid consisting of about 5–20% acetic acid (CH3COOH), water, and other trace chemicals, which may include flavorings.

This makes the title for your post not agree with the contents of your post
which makes us unsure as to what you really did

[billnotgatez]

Also this appears to be similar to a previous post
http://www.chemicalforums.com/index.php?topic=84352.0

In that post you did not participate very well as to the forum rules.

Please write some possible formulas for the reactions.
Maybe start with the first one with iron filings and vinegar.
You can write the the acetic acid as
CH₃CO₂H

[Arkcon]

I've decided to merge the two postings into one thread, so everyone can see all the questions, at one.