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The reaction is no longer operating and no longer producing heat, which causes the temperature to drop. Additionally, the temperature of the reactant solution added after the stoichiometric point is achieved is lower than that of the reaction mixture.

What is Stoichiometric Point?

The titration's equivalence point is reached by adding just enough titrant to totally neutralize the analyte solution. The titrant's moles (a standard solution) are equivalent to the moles of the unknown-concentration solution. Because it is at this point that the quantity of acid needed to neutralise an identical amount of base is equal, it is often referred to as the stoichiometric point. Please take note that this does not imply that the acid to base ratio is 1:1. The equation for a balanced acid-base chemical reaction determines the ratio.

Actually at the equivalence point, the titrant and analytes have completely reacted, that's why temperature drop.

The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of bases and acids have been mixed

Learn more about Stoichiometric Point from given link

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