Homework Help: Chemistry

Posted by Taylor on Sunday, February 26, 2012 at 9:51pm.

If acetic acid is the only acid that vinegar contains , calculate the concentration of acetic acid in the vinegar. if the pH of vinegar is 2.7

Chemistry - DrBob222, Sunday, February 26, 2012 at 9:58pm
pH = -log(H^+)
2.7 = -log(H^+).
(H^+) = 0.002
.........CH3COOH ==> H^+ + CH3COO^-
...........x.........0.002..0.002

Ka = (H^+)(CH3COO^-)/(CH3COOH)
Substitute 0.002 for H^+ and CH3COO^-, and x0.002 for CH3COOH, look up Ka, solve for x which = (CH3COOH)
Chemistry - Anonymous, Wednesday, January 30, 2013 at 2:07pm
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