Prelaboratory Questions And Problems

1. Compare the following redox mediators: Ag(II/I), Co(III/II) and Fe(III/II) in terms of a) their oxidizing power (i.e., compare their standard potentials), b) their cost per mole of electrons removed (assume that the most common nitrate salts are used for the initial, low oxidation state of each redox couple), and c) the possibility of using them with chlorinated organic wastes.

(Hint: costs can be looked up in any commercial catalog of chemicals or in the Chemical Marketing Reporter).

2. When should an indirect method be considered for the electrochemical oxidation of a waste?

3. Write down the (balanced) equation that describes the reaction between calcium hydroxide and carbon dioxide.

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