by Gary L. Bertrand
University of Missouri-Rolla
This is an interactive
simulation of electrochemical cells, involving various metal
electrodes. The electrode is immersed in a solution of its
nitrate salt. Various cells may be constructed and the expected
voltage of a cell is displayed. Calculations are based on the
Nernst Equation using reasonable approximations for activity
coefficients and the assumption of zero junction potential across the
sodium nitrate salt bridge. Cells may be constructed in order to
solve problems presented at several levels, using measured voltages and
an abbreviated Table of Standard Reduction Potentials,
included in the program.
(0) The student may construct cells with various
electrodes (including the Pt/Hydrogen
the voltages of these cells may be measured.
A cell is presented, and the student is asked to
calculate the cell's standard potential (Eo).
(2) There is a fictitious
metal/salt pair, Whodatium
(Wd)/Whodatium (II) Nitrate. The user
is asked to
standard reduction potential (Eo) for this
(3) The student is asked to design a cell which will produce
specified standard potential (Eo).
(4) A cell is presented (with
the student is asked to calculate the
expected voltage (E) of the cell.
(5) The electrode menu contains five fictitious
metals: Fonium (Fo),
Mysterium (My), Oddmium (Od), and Whodatium (Wd).
These metals have different
properties in each problem.
The user is asked to determine the activity series
metals. In the activity series,
the most active metal has
the most negative reduction
potential and the least active metal has the most positive reduction
(6) The user must determine the mean ionic activity
coefficient of Whodatium (II)
in a 1.00 M solution.
(Physical Chemistry Level)
Answers to the problems are checked by the program.
Thanks to Michael Cheney, AP Chemistry Instructor at
Crestview High School, Crestview, FL
for the idea for this simulation, and for many helpful suggestions in