Acid-Base Titration Simulation Activity
The acid-base titration computer simulation to accompany this tutorial is located at URL:
http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/stoichiometry/acid_base.html or access the
link from your teacher’s web page (Links section).
For this tutorial you will compare the pH at various points during the titration of HNO3 vs. KOH to the pH at the same
points during the titration of a HNO3 vs. Ba(OH)2. You need to show the calculations for each section of each activity. For
each activity, create a data table like the one illustrated below:
ACID
MOLARITY
OF ACID
VOLUME
OF ACID
BASE
MOLARITY
OF BASE
VOLUME
OF BASE
Activity 1: Go to the computer simulation and select "Strong Acid vs. Strong Base." Click fill the buret with Base. Select
HNO3 as the acid and KOH as the base. Select phenolphthalein as the indicator. The computer will automatically assign
you a molarity for the acid and a volume for the acid. Record your molarity/volume in your data table
A. Calculate the pH of the acid before any base is added.
B. Add 12.0 mL of the KOH. Write a chemical equation showing what happens when HNO3 reacts with KOH.
C. Titrate to the end point, calculate the molarity of the base, enter this number and click-on "OK".
D. Calculate the pH of the resultant solution when you added 10.0 mL of the KOH.
E. Click-on "graph". Make a sketch of this graph and indicate the following points: the initial pH of the acid, the
point where 10.0 mL of KOH is added (and its pH), the equivalence point (and its pH).
Activity 2: Go to the computer simulation and select "Reset." Select "Strong Acid vs. Strong Base." Click fill the buret
with Base. Select HNO3 as the strong acid and Ba(OH)2 as the base. Select phenolphthalein as the indicator. The computer
will automatically assign you a molarity for the acid and a volume for the acid. Record your molarity/volume.
F. Calculate the pH of the acid before any base is added.
G. Add 7.0 mL of the Ba(OH)2. Write a balanced chemical equation that illustrates what happens when HNO3
reacts with Ba(OH)2.
H. Titrate to the end point, calculate the molarity of the base, enter this number and click-on "OK."
I. Calculate the pH of the resultant solution, when you add 10.0 mL of the Ba(OH)2.
J. Click-on "graph". Make a sketch of this graph and indicate the following points: the initial pH of the acid, the
point where 10.0 mL of Ba(OH)2 is added (and its pH) , the equivalence point (and its pH).
Activity 3: Compare the amount of 0.200 M KOH needed to neutralize 50.0 mL of 0.200 M HNO 3 with the amount of
0.200 M Ba(OH)2 needed to neutralize 50.0 mL of 0.200 M HNO3. Is the volume of KOH more, less, or the same? Explain
and/or show.
*You do not need a conclusion for this lab. Just be sure to show ALL calculations and that each activity’s data table is
complete.