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Lab_3_acid_titration

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					              CVEG 5234                             Water and Wastewater Analysis                                 Spring 2005


              Lab Exercise: Acid Titration
              Wednesday, February 16, 2005

              Titrate Acetic Acid and Boric Acid with NaOH according to example 4-18 (500 mL of 0.01 M acid with
              0.5 M NaOH). The expected results are shown below. Also shown is a graph showing expected titration
              curves for three weak acids, a strong acid (HCl) and no acid.

              Form two groups:
                           Acetic acid
                           Boric acid

              In your lab report:
                 Graph the results.
                 Comment on how your results compare with the expected results.
                 Comment on where the pH equals the pKa on the curve.
                 If you didn’t know the pKa, could you find it from the titration results?
                 Comment on how the titration curves for all the acids are related to the pK a for each acid.


     14                                                                   14

                                                                                              No acid (real weak acid)
     12                                                                   12


     10                                                                   10
                                                                                     Boric
      8                                                                   8
                                                                     pH
pH




                                                                                         Carbonic
      6                                                                   6


                                                                          4
                                                                                                   Acetic
      4
                                         Boric Acid
      2                                                                   2                                 HCl
                                         Acetic Acid

      0                                                                   0
                                                                               0               5                    10          15
          0                5                10                 15
                                                                                                     m L NaOH
                               mL NaOH

				
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