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Kw of water from reduction potentials

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a). Give the cell diagram notation of the electrochemical cell that could be used to determine experimentally the dissociation constant (Kw) of water. The standard reduction potential for

O2 + 2H2O + 4 e-------> 4OH- is + 0.40V

For other half-reactions, use a textbook. Calculate E for this cell.

b). Use your value from part a) to calculate the dissociation constant at 298K.

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Solution Preview

We need H2O ----> H+ + OH- E = ?

O2 + 2H2O + 4 e-------> ...

Solution Summary

The dissociation constant of water is calculated from electrochemical diagrams.