Conductivity changes as a product increases or reactant decreases, so we can follow the concentration or extent of reaction if we measure conductivity. This is typically for Titrations (i.e. the molecular HA will form ionic H+ and A- in solution, which make conduciton possible)
The temperature is helpful for those reaciton which are either endothermic or exothermic.
As T increases, if this is exothermic, we can assure the reaction is proceeding in the forward direction
If T decreases, and this is endothermic, the reaction is also going in the forward direction
Therefore, both are excellent types of variables which let us know the type of reaction and extent of reaction
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