The terms used when equivalent amounts of each reactant have reacted are the following, except:

• A. End point
• B. Equivalence point
• C. Stoichiometric point
• D. Theoretical point

Answer: (A)

The point where equal moles of each reactant have reacted is defined as the equivalence point. In titration language, equivalence point and the stoichiometric point describe that exact balance of reactants. The theoretical point is a calculated reference for where that balance should occur based on the known amounts and reaction stoichiometry. The end point, however, is the observable moment when the indicator signals completion—usually a color change. It is an operational signal, not the actual balance of moles, and it can occur slightly before or after the true equivalence point. So the term that does not describe the amount drawn from the reaction stoichiometry is the end point.