[nexisrocks]

I'm trying to explain potentiometry in a report, and I'm not sure on a few parts.  I know it works, but I can't quite put my finger on the theory behind some of it:

• The graph is plotted as E vs. log[Cl^-]... why use log[Cl^-]?
• On the graph, the slope of the line is E/[Cl^-]... what does this mean?  What is the significance of this number?
• What is the relation between E and [Cl^-]?

Any help is greatly appreciated!

[Borek]

The graph is plotted as E vs. log[Cl^-]... why use log[Cl^-]?

Two reasons. One is Nernst equation, second is the range of [possible Cl^-] changes.

Both other questions are Nernst equation related.