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The Gouy method is a technique used to measure the molar conductivity of an electrolyte solution. It involves measuring the change in refractive index of the solution as a function of the concentration of the electrolyte. The method is based on the principle that the refractive index of a solution is related to the concentration of the dissolved species. By measuring the refractive index of the solution at different concentrations, the molar conductivity can be calculated. The Gouy method is a relatively simple and accurate method for measuring molar conductivity, but it can be time-consuming and requires careful temperature control.