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Basics of thermometric titration

Schematic of a thermometric titration curve

 

In thermometric titration the reaction enthalpy is used to follow the chemical reaction.

Every chemical reaction is accompanied by a change in enthalpy (ΔH). The following equation applies.

ΔH = ΔG + TΔS, where
ΔG = change in free reaction energy
T = absolute temperature
ΔS = change in reaction entropy

As long as the reaction takes place, this results in either an increase (exothermic reaction) or decrease (endothermic reaction) in the temperature of the sample solution. For a simple reaction this means that the increase or reduction in temperature depends on the converted amount of substance.

The result is that in a thermometric titration a change in temperature can only be observed as long as the added titrant reacts with the analyte in the sample solution.

Read more details in our monograph « Practical thermometric Titrimetry»