The following data were obtained by preparing each standard solution by diluting the appropriate volume of a \(1.00 \times 10^{-2} \mathrm{M} \mathrm{Cl}^{-}\)stock solution into \(250 \mathrm{ml}\) volumetric flasks and diluting to the mark with deionized water. Before measuring, \(100.0 \mathrm{ml}\) of each standard was spiked with \(1.00 \mathrm{ml}\) of \(4 \mathrm{M} \mathrm{NaNO}_{3}\) to adjust the ionic strength.

(a) What concentration of chloride ion would be indicated for a sample that was also treated with ionic strength buffer and gave a signal of \(15.5 \mathrm{mV}\) ?

(b) If the sample had not been treated with \(\mathrm{NaNO}_{3}\) to adjust the ionic strength before measuring, what would the potential reading have been (neglecting the influence on the junction potential for the reference bridge)?

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[Chloride] 1.00 x 10-3 1.0010-4 1.00 x 10-5 E (mV) -113.0 -54.0 5.0 5.00 x 10-6 22.8 1.00 x 10-6 64.0 5.00 x 10-7 81.8