Which of the following best describes the end point in a titration?

The end point in a titration is typically defined as the moment when the reaction between the titrant and the analyte is effectively complete. At this point, the quantity of titrant added is stoichiometrically equivalent to the amount of substance in the solution, indicating that the intended chemical reaction has reached its completion. Additionally, it can also often be described as the point where any further addition of titrant will not produce a significant change in the result, meaning further titration would not yield any new information regarding the concentration of the analyte being measured.

This is why the correct choice encompasses both aspects: it highlights that the end point signifies the completion of the reaction and recognizes that, beyond this point, additional titrant does not affect the measurement significantly. This dual perspective captures the essence of what the end point represents in the context of titration procedures, making it a comprehensive definition.