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Chem 125
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Titration Lab Report Sheet
Part 1A:
Titration of a Strong Acid with a Strong Base
Formula of Acid:
HCl
Concentration of Acid:
.1M
Formula of Base:
NaOH
Concentration of Base:
.05M
1.
Write the
molecular equation
(including states of matter) for this reaction.
HCl
(aq)
+ NaOH
(aq)
=> NaCl
(aq)
+ H
2
O
(l)
2.
Write the
net ionic equation
(including states of matter) for this reaction.
HCl
(aq)
+OH

=> Cl

+ H
2
O
(l)
3.
Calculate the volume of base required to reach the equivalence point of this titration.
Remember that you used 3.0 mL of acid in this titration.
C
1
V
1
=C
2
V
2
(.1M)(3.0 ml)=(.05M)( V
2
)
V
2
= 6 mL
4.
At the equivalence point, is the solution expected to be (circle one):
acidic
basic
neutral
Explain your reasoning.
I would suspect that this reaction should be neutral at equivalence point.
It would be neutral
because at equivalence point you have added the same amount of moles base to you moles of
acid or vice versa.
•
Create a graph in Excel (using your Logger Pro data) showing the relationship
between pH and time of reaction.
For the graphs in this report, choose the smooth line
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option (with no data points) in screen 1 of the Chart Wizard
!!
Attach this graph to your
report.
•
Create a second graph of your data showing the relationship between ∆pH and time (a
first derivative plot).
Attach this graph to your report.
For ∆pH, have excel calculate the difference between two neighboring pH points vs.
time. For example, if your first pH is in cell B1 and second is in B2, then cell C2 should
have the equation =B2B1.
Then copy this formula all the way down.
To figure out what the
exact pH
is at a particular point, hold your mouse over the
graph so that the data points show up.
5.
What is the
exact pH
of your solution at the equivalence point?
Show or explain how you determined the pH point at the equivalence point.
I found the top of the equilibrium curve and took half of that and found the pH value.
It turned
out to be at time 61 and it = 2.37571662
Part 1B:
Titration of a Weak Acid with a Strong Base
Name of Acid:
Mateic Acid
Concentration of Acid:
.1M
Formula of Base:
NaOH
Concentration of Base:
.05M
1.
Is the weak acid (circle one):
monoprotic
diprotic
Explain how you determined this answer from your experimental data.
It is diprotic because of the double equilibrium points in the graph.
This acid has 2 H in it, the
first curve is when it loses one and the second occurs when it loses the second.
2.
If maleic acid could be represented by the formula H
2
Ma, write the
two net ionic equations
for maleic acid’s reaction with NaOH in the space below (be sure to include states of matter).
Step 1:
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 Winter '08
 Retsek
 Chemistry, Mole

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