Objectives

After performing this experiment, the student shall be able to:

• Verify experimentally many of the transitions in metal Pourbaix diagrams.

• Understand the role of potential in metal specia-tion.

• Understand the role of pH in metal speciation.

in the £-pH diagram can be readily observed, as described below. It is important to respond in advance the second question in the prelaboratory assignment, see below. (Note that the equations and the diagram given there assume 1 M solutions, whereas the experiment is suggested for more dilute conditions. Also note that due to the qualitative nature of the experiment, the amounts and parameters given below, in the experimental procedure, are to be taken only as a guide and thus need not be reproduced exactly).

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