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cetylsalicylic acid, a monoprotic weak acid, is the active ingredient in aspirin. Two aspirin tablets, each...

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Chemistry

cetylsalicylic acid, a monoprotic weak acid, is the activeingredient in aspirin. Two aspirin tablets, each containing 500.0mg of acetylsalicylic acid, are dissolved in 25.0 mL water. a.Calculate the pH of the solution. b. Calculate the percentionization of acetylsalicylic acid in the solution. (2 pts)

Answer & Explanation Solved by verified expert
3.6 Ratings (643 Votes)

molarity =   W*1000/G.M.Wt*volume of solution in ml

                = 500*10-3 *1000/180.15 *25    = 0.111M

   HA   ------------> H+ + A-

I          0.111                0        0

C         -x                      +x        +x

E        0.111-x                +x       +x

      Ka   = [H+][A-]/[HA]

    3*10-4   = x*x/0.111-x

   3*10-4 *(0.111-x) = x2  

            x= 0.0056

[H+] = x = 0.0056M

PH = -log[H+]

        = -log0.0056   = 2.2518

[H+] = C*ionisation

ionisation% = [H+]*100/C

                       = 0.0056*100/0.111 = 5.045%
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