A lithium ion-selective electrode gave the potentials given below for the following standard solutions of LiCl and two samples of unknown concentration:
Solution (aLi+) | Potential vs. SCE, mV |
0.100 M | +1.0 |
0.050 M | -30.0 |
0.010 M | -60.0 |
0.001 M | -138.0 |
Unknown 1 | -48.5 |
Unknown 2 | -75.3 |
(a) Construct a calibration curve of potential versus log aLi1 and determine if the electrode follows the Nernst equation.
(b) Use a linear least-squares procedure to determine the concentrations of the two unknowns.
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