Solution preparation and conductivity measurements: an experiment for ıntroductory chemistry
KünyeESLEK, Z., TULPAR, A. (2013). Solution preparation and conductivity measurements: an experiment for ıntroductory chemistry. Journal of Chemical Education, 90 (12), pp. 1665-1667. http://dx.doi.org/10.1021/ed300593t.
The aim of this general chemistry laboratory exercise is to teach students how to prepare solutions of known concentration from a solid (NaCl) and by dilution from a stock solution. After preparing the solutions, the students perform conductivity measurements to check the accuracy of the concentrations. Using Kohlrausch's law and the conductivity data, they back-calculate the concentration. The students also measure the conductivity of a weak electrolyte (CH3COOH) solution at the same concentration as the NaCl solution to better understand the difference between a strong and a weak electrolyte.