can you explain how would you get the 66.64 as slope? And what is the X and Y in the LR based on the table?

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A lithium ion-selective electrode gave the potentials given below for the following standard solutions of LiCl and two unknown samples: solution (ali*), M Potential vs SCE, mV 0.100 + 1.0 0.050 -30.0 0.010 -60.0 0.001 -138.0 unknown 1 -48.5 unknown 2 -75.3 Construct a calibration curve of potential versus log ali*. Does the electrode follow the Nernst equation? Use LR to calculate the concentration of the two unknown solutions. A lithium ion-selective electrode gave the potentials given below for the following standard solutions of LiCl and two unknown samples: solution (ali*), M Potential vs SCE, mV 0.100 + 1.0 0.050 -30.0 0.010 -60.0 0.001 -138.0 unknown 1 -48.5 unknown 2 -75.3 Construct a calibration curve of potential versus log ali*. Does the electrode follow the Nernst equation? Use LR to calculate the concentration of the two unknown solutions.