Step by step instructions:
1) Start DATABASE and click on Cu
(copper) in the periodic table. Click on Cu 2+
in the list of available components. Click also on the
e- (electron) button. To add cyanide as
a component, click either on C or N
in the periodic table, and then on CN-
in the list of available components.
The list of components selected will now show H+,
e-, Cu 2+
and CN-. Click on the pull-down menu
File / Save and Exit.
Click on the SPANA button to save the data file and to make a diagram.
Enter a file name, for example Cu-CN.
2) The SPANA main window will
appear. Click on the pull-down menu
Run / Make a Diagram.
A new window appears to select what type of diagram is wanted.
Change the diagram type to Fraction.
Change the component in the X-axis to CN-.
On the Concentrations frame click on the
pH = 7 line, change pH for
Total conc., change the value to 1e-4
and press Enter. Then, on the same
concentrations frame, click on the pe = 8.5
line, enter a total concentration of zero for e− and press
Enter. Similarly, change the total concentration of Cu 2+
to 0.01 ([Cu]T = 10 mM). Change also the
concentration interval for CN− from zero to
0.03 M.
Click on the Diagram button in the upper-left corner of the window.
The calculations will be done by a console program.
When the calculations are finished the diagram is displayed in a window.
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