Titration of an Unknown Acid or Base
The applet below simulates the titration of an unknown acid or base.
To set-up the titration, the user must
-
Select one of the unknown compounds
-
Enter the mass of the unknown to be titrated
-
Enter the volume of water in which to dissolve the unknown
-
Select a titrant (0.1000 M NaOH or 0.1000 M HCl)
As soon as a valid mass and volume are provided, the pH of the solution
will be shown. Once the titration is started (by adding titrant), the titration
conditions cannot be altered.
Titrant may be added by selecting the "Add Titrant" button. The volume
of titrant added may be chosen from the list below the button. As in a
laboratory experiment, one must periodically record data in a laboratory
notebook. By selecting the "Record Point" button, the current volume of
titrant added and solution pH are entered in the electronic notebook at
the right of the applet and the data point is plotted on the titration
curve.
There are several restrictions in this titration:
-
No more than 50.00 mL of titrant may be added. (One is not allowed to refill
the buret!)
-
No more than 100 data points may be recorded.
The possible unknown compounds are taken from the list of amino acids in the table shown below. You should be able to unambiguously identify the unknown compound and to determine
the acid dissociation constant(s) from the titration data. (Each time the
applet is loaded, the list of unknowns is scrambled.) When you think you
have identified the unknown and determined the acid dissociation constant(s),
select the "Show Unknown" button to check your conclusions.
| Compound Name |
Formula Weight |
pKa |
| Alanine Hydrochloride |
125.556 |
2.34
9.69 |
| Glycine Hydrochloride |
111.53 |
2.350
9.778 |
| Glutamic Acid, Disodium Salt |
191.09 |
2.23
4.42
9.95 |
| Leucine, Potassium Salt |
169.27 |
2.329
9.747 |
| Lysine Dihydrochloride |
219.11 |
2.18
8.95
10.53 |
| Phenylalanine Hydrochloride |
210.65 |
2.20
9.31 |
| Tyrosine Hydrochloride |
217.65 |
2.20
9.11
10.07 |
Applet Name: titrate.Titrate.class
Archive: titrate.jar
Version: 0.1 (May 1998)
The beynon.class applet was written by David N. Blauch (© Copyright 1998-1999 Davidson College).
Conditions of Use
This applet is still under development; additional refinements will be forthcoming. Known problems and the revision history are listed at the bottom of this page. Please send feedback on performance and information on problems to David N. Blauch.
This applet requires a Java-enabled browser that supports Java 1.1. Netscape Navigator 4.04 or later (with the JDK update for version 4.04) and Internet Explorer 4.1 provide such support.
Please let me know how you like this applet. If you encounter any bugs or errors,
please provide me with the specific details. I would also appreciate any suggestions for improvements.
David N. Blauch; dablauch@davidson.edu
© Davidson College, August 1998
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Last updated Wednesday October 16 2002