In elctrochemistry labs why should we measure a standard cell potential (Ecell) even if the metal ion concentrations are 0.1M not 1M?

Answer 1

If the concentrations aren't 1 M, then you aren't really measuring the STANDARD cell potential, but rather the cell potential under the given conditions. You can calculate the standard cell potential by using the Nernst equation: Ecell = Eºcell - RT/nF ln Q