How can conductance changes be used to measure chemical relaxation?

In the study of chemical relaxation, conductance changes serve as a diagnostic tool to monitor the kinetics of fast reactions. When a system at equilibrium is subjected to a rapid perturbation—such as a temperature jump—the concentrations of chemical species shift to reach a new equilibrium state.12

If the reaction involves species with different ionic properties, this shift in concentration results in a measurable change in the solution's conductance. Because conductance is directly dependent on the number, charge, and mobility of ions present in the solution, monitoring these changes over time allows researchers to track the progress of the reaction.3

By recording how the conductance evolves as the system relaxes toward its new equilibrium, scientists can determine the relaxation time ($\tau$). This value is essential for calculating reaction rates and deducing the underlying chemical reaction mechanisms. This approach is particularly valuable for studying rapid processes that occur too quickly for conventional steady-state measurement techniques.124