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# Proportions and chemistry calculation?

If the pH of vinegar is 2.2, what proportion of acetic acid in the vinegar is in the protonated form?

### 1 Answer

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- davidLv 72 months agoFavourite answer
Vinegar is a solution of acetic acid -- Ka = 1.8x10^-5

HC2HO2 <--> H+ + C2H3O2-

pH = 2.2 ... [H+] = 10^-2.2 = 0.00631 M

Ka = [H+][C2H3O2-] / [HC2H3O2]

1.8x10^-5 = (0.00631)^2 / [HC2H3O2]

[HC2H3O2] = 2.21 M <<< this is the 'pronated form'

proportion?? I have never seen a question ask for proportion .. I can get the a ratio

[HC2H3O2] / [H+] = [H+] /Ka = 0.00631/1.8x10^-5 = 350 to 1

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