Strong Acid

 

                

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Titration of Strong Acids with Strong Bases

The strong acid-strong base titration can be classified into four distinct regions.   These are described below for the stepwise addition of strong base to a strong acid solution.

  1. Solution of only strong acid (solution of H3O+)
  2. Excess moles of strong acid + limiting moles of strong base (solution of H3O+)
  3. Equivalence Point with equal moles of strong acid + strong base (solution of H2O)
  4. Excess moles of strong base + limiting moles of strong acid (solution of OH-)

The following example illustrates the calculations involved in the titration of a strong acid with a strong base.  Note that the titration of a strong base with a strong acid occurs in a similar fashion.  The four regions outlined above are presented stepwise as strong base is titrated into the strong acid.  Be sure to understand the techniques used to solve for the concentrations of species involved in each step along the way.  Click on a "titrant added" value to see the calculation pertaining to that point in the titration.

SAMPLE:  receiving flask containing 50.00 mL of a 0.100 M HBr(aq) solution.

TITRANT:  stepwise addition of a 0.200 M KOH(aq) solution from a buret using the following volumes:

titrant added region classification

pH of resulting solution
0.00 mL 1 1.00
10.00 mL 2 1.30
24.90 mL 2 3.57
25.00 mL 3 7.00
25.10 mL 4 10.42
30.00 ml 4 12.10
40.00 ml 4 12.50

*Special thanks to Dr. Fred Wood at U.C. Davis for the foundations of this tutorial!