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?
- 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