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Ionic Strength and Potentiometric Titration

Hi there!

To determine E0(Ag+/Ag), we are meant to plot Em+E(Cal)-(RT/F)ln[c(Ag+)/c0] against I12\mathrm{I}^\frac{1}{2}. E(Cal) is the potential of the calomel electrode that we used as a reference. c0 is given as 1mol/L. Extrapolation of the resulting graph to zero ionic strength gives a value for E0(Ag+/Ag).

My problem is that I don't know what is meant by I12\mathrm{I}^\frac{1}{2}. I know "I" is the ionic strength but is the "12\mathrm{}^\frac{1}{2}" meant in a mathematical way or is "I12\mathrm{I}^\frac{1}{2}" a term for a specific ionic strength? Also, I'm not sure what Em stands for. As we titrated silver nitrate with KCl, the potential difference was changing so I assumed that Em are the values for the changing potential difference, but I am not sure about this.

Any help greatly appreciated!

cruel

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