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Calculation of a Titration Curve

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					                           Calculation of a Titration Curve

Initial conditions: 25.0 mL of 0.250 M HCl being titrated with 0.250 M NaOH

   1. What is the pH of the acid in the flask?
   2. What is the pH of the NaOH in the buret?
   3. What is the volume at the equivalence point?
   4. Complete the following table (feel free to use Excel  ):
    VNaOH
                               mmoles          mmoles
   added        VTot (mL)                                     [H+]            pH
                                NaOH            HCl
    (mL)
      0           25.0             0            6.25         0.250
      5           30.0           1.25          5.00           0.167
      5
      5
      5
      2
      1
      1
     0.5
    0.25
   0.125
 Veq + 25.0                                    [OH-]          pOH             7.00
   0.125                       0.0313        6.2 x 10-4       3.20
    0.25
     0.5
      1
      1
      2
      5
      5
      5
      5

   5. Plot pH (y-axis) vs. total volume of NaOH added. Identify the equivalence point
      and sketch over your calculated curve what the titration curve of a weak acid
      with a pKa=5.82 would look like (all other initial conditions identical).

				
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posted:11/30/2011
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