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Pre-lab 5.3.c Ionic Strength Considerations

Pre-lab 4.4 discusses the importance of having an electrolyte in your electrochemical set-up. In addition, as with all thermodynamic measurements, the ionic strength must be constant in electrochemical analysis. The concentration of electrolyte (KN03) needed to maintain a constant ionic strength (yu, = 0.1 m) is calculated using the equation (5.12), where c is the concentration of the ith ion with charge z. Note that a more rigorous treatment of ion activity is used in Chapter 7 (experiment 7.4). [Pg.122]

When the cobalt(III) complex has been reduced to cobalt(II), the metal center may become sensitive to oxidation by atmospheric 02 and will compete with the oxidation of the complex at the electrode surface. For this reason, all samples must be rigorously purged with Ar,g) or N2(g and solutions kept under a blanket of inert gas during the experiment. [Pg.122]

It is advisable to begin this experiment by reading Pre-lab 4.4 and carrying out Procedure 4.4. a to ensure that your system is working properly. [Pg.122]


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Pre-lab

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