Anonymous
Anonymous asked in Science & MathematicsChemistry · 2 months ago

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?

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  • david
    Lv 7
    2 months ago
    Favourite 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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