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 Post subject: what is the pH of 5% vinegar?Posted: Tue May 06, 2014 6:49 am

Joined: Sat Oct 10, 2009 10:59 pm
Posts: 11
i get a pH of .08 so something is wrong because I know it"s at least 2. I took 50 grams per liter, and divided 50 by 60.05. And I did the negative log of that and got .08. Somebody please help!!!

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 Post subject: what is the pH of 5% vinegar?Posted: Fri Jul 06, 2018 9:37 pm

Joined: Thu Apr 02, 2009 11:09 pm
Posts: 2615
Apple Cider Vinegar Benefits - http://AppleCiderVinegar.siopu.com/?yxF

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 Post subject: what is the pH of 5% vinegar?Posted: Fri Dec 21, 2018 1:31 am

Joined: Thu Apr 02, 2009 10:42 am
Posts: 1373

RE:
what is the pH of 5% vinegar?
i get a pH of .08 so something is wrong because I know it&#39;s at least 2. I took 50 grams per liter, and divided 50 by 60.05. And I did the negative log of that and got .08. Somebody please help!!!

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 Post subject: what is the pH of 5% vinegar?Posted: Mon Jan 14, 2019 7:19 am

Joined: Thu Apr 02, 2009 10:45 am
Posts: 1782
The pH of vinegar depends upon how much acid i present, but most commercial distilled white vinejar contain 5% acetic acid and have a pH of about 2.4.

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 Post subject: what is the pH of 5% vinegar?Posted: Tue Mar 26, 2019 2:32 am

Joined: Thu Apr 02, 2009 3:56 pm
Posts: 1379
w(CH3COOH) = 5%

so n = 50 / 60.05 = 0.832 mol

since v=1L , c = 0.832 mol/L

Acetic acid is a weak acid (you cant calculate pH with the formula pH = -lojc) so you need to know the constant of dissociation Ka which for acetic acid i 1.74 * 10^-5
Then you find pH according to the formula c(H+) = (Ka*c)^1/2

pH = (1/2)*pKa - (1/2)logc

pH = 0.5*(4.759) - [0.5*(-0.079)]

pH = 2.3795 + 0.0395

pH = 2.419

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