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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: ntpt on February 21, 2006, 02:51:51 AM

Title: percentage by mass of ethanoic acid in 25ml of vinegar?
Post by: ntpt on February 21, 2006, 02:51:51 AM: Does neone know roughly the percentage by mass of ethanoic acid in 25ml of vinegar? My calculations ended up to be 0.22% ....is that way incorrect???
Title: Re:vinegar
Post by: pantone159 on February 21, 2006, 02:57:18 AM: Mine says 5%. I assume this is weight percentage, but I don't know that for sure.
Title: Re:vinegar
Post by: Borek on February 21, 2006, 03:50:06 AM: White vinegar here is sold in two varietes - 5% and 10%. Probably w/w although I assume it doesn't make any difference whether it is w/w, w/v or v/v - accuracy of the concentration given on the label is so small that it doesn't matter.

0.22% looks too small to me, 2.2% will not rise a brow.

Show you calculations.
Title: Re:vinegar
Post by: Alberto_Kravina on February 21, 2006, 08:36:09 AM: Quote
White vinegar here is sold in two varietes - 5% and 10%.
Be careful-some concentrated vinegar that is sold can have >60% CH₃COOH
Title: Re:vinegar
Post by: Borek on February 21, 2006, 10:16:30 AM: Quote from: Alberto_Kravina on February 21, 2006, 08:36:09 AM
Be careful-some concentrated vinegar that is sold can have >60% CH₃COOH

On the shelf in the hipermarket? I doubt.
Title: Re:vinegar
Post by: qlabel on February 21, 2006, 10:16:36 AM: Quote from: Alberto_Kravina on February 21, 2006, 08:36:09 AM
Be careful-some concentrated vinegar that is sold can have >60% CH₃COOH
more then 60 % ????
Title: Re:vinegar
Post by: Alberto_Kravina on February 21, 2006, 10:32:06 AM: Quote from: Borek on February 21, 2006, 10:16:30 AM
On the shelf in the hipermarket? I doubt.
Maybe you can't find it in Poland, but you can find them-on the shelf of a hipermarket- here in Austria.

See my attach-it says 78-80% (sorry for the picture quality)
Title: Re:vinegar
Post by: Borek on February 21, 2006, 10:57:44 AM: Well, I am not discussing with the facts :)

But it is crazy.

Too dangerous for a normal kitchen IMHO.
Title: Re:vinegar
Post by: Bakegaku on February 21, 2006, 01:32:51 PM: Hmm... in America vineger is usually somewhere between 3% and 10%. It would help to see how you got your answer of 0.22%.

Some types are sold to more professional cooks with upwards of 30%, but nowhere near 60 or 80%.

Why did you lean a Euro by the bottle of vinegar? at first I thought it was censorship or something, but it's nowhere near the brandname.
Title: Re:vinegar
Post by: Alberto_Kravina on February 21, 2006, 01:40:52 PM: Quote
Why did you lean a Euro by the bottle of vinegar? at first I thought it was censorship or something, but it's nowhere near the brandname.
I put it there so that you guys can see how big this bottle actually is
Title: Re:vinegar
Post by: arnyk on February 24, 2006, 05:56:22 PM: Glacial acetic acid is pretty close to 100%, at least the stuff I've used before.