Smells like Salad Dressing deux

"RacinBob" (racinbob) 04/10/2016 at 15:10 • Filed to: None

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Yesterday I wrote on how a vinegar soak removed the rust from a pliers. 37 years ago, I studied chemistry but those brain cells are long gone. I know it’s acetic acid and FeO2 that’s reacting, would anybody care to block out the reaction and explain why it works.....

TheHondaBro > RacinBob 04/10/2016 at 15:14

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The vinegar is like Batman and the rust is like the Joker. Batman will scare the Joker away.

Or something like that.

Shmevans > RacinBob 04/10/2016 at 15:16

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Vinegar contains acetic acid CH 3 COOH which reacts with rust FeOOH:
3CH 3 COOH + FeOOH —> Fe(CH 3 COO) 3 + 2H 2 O
and iron (III) acetate Fe(CH 3 COO) 3 is water soluble.

Source: http://www.thenakedscientists.com/forum/index.ph…

Shmevans > TheHondaBro 04/10/2016 at 15:17

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Science is amazing.

Daily Drives a Dragon - One Last Lap > RacinBob 04/10/2016 at 15:17

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Something with chemistry. That’s all I got.

RacinBob > TheHondaBro 04/10/2016 at 15:18

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Well I know Acetic acid is CH3COOH and Iron Oxide is FeO2. It appears that there is CO2 given off, just not sure what the Iron reaction is.....

I used to be smart about these things, not any more so I figured someone on this could do the reactions in their sleep. Just curious.

RacinBob > Shmevans 04/10/2016 at 15:28

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Interesting, what was causing the bubbles?

Speaking of rust

Shmevans > RacinBob 04/10/2016 at 15:37

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Hmm, I wasn’t really prepared for follow-up questions. Ha. My googling is far better than my chemistry. Maybe there is something going on with they foam plate as well? ‘Cause there shouldn’t be leftover gasses.

MrDakka > RacinBob 04/10/2016 at 15:59

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The bubbles are most likely hydrogen bubbles from the pure iron (either clean patches and/or exposed after the rust has been consumed from an area) reacting with acetic acid like with any metal place in acid. You have to remember, chemistry is messy and mutilple reactions occur simultaneously.

KusabiSensei - Captain of the Toronto Maple Leafs > RacinBob 04/10/2016 at 17:41

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Normally rust is Iron (III) Oxide. So you have Fe2O3 + Acetic Acid yields something that may involve CO2 gas or H2 gas.

EDIT: In oxidation state 2, you would have Iron (II) Oxide, or FeO. FeO2 doesn’t exist naturally (as the oxidation states do not balance out, and it’s not a covalent compound)

415s30 W123TSXWaggoIIIIIIo ( •_•))°) > RacinBob 04/10/2016 at 17:41

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Better keep vinegar away from Datsuns.

415s30 W123TSXWaggoIIIIIIo ( •_•))°) > RacinBob 04/10/2016 at 17:42

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Reactions and science

RacinBob > KusabiSensei - Captain of the Toronto Maple Leafs 04/10/2016 at 18:27

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Well there is some kind of gas being formed, I used a gallon to clean up my come along that I used as a race car tie down after I used it on an open trailer in the salt. Look at this. I didn’t take a before picture but it was all surface rust before.