Final answer:
The equivalence point in an acid-base titration is when the moles of acid and base are equal, while the end point is signaled by a color change due to an indicator. The equivalence and end points are meant to align closely but are not the same.
Step-by-step explanation:
The statement that in acid-base titration, the equivalence point is when moles of acid and base are equal is correct. This is the point where a stoichiometric amount of titrant has been added to completely react with the unknown concentration. However, the statement that the end point is when the volume of titrant equals the volume of the aliquot is not entirely accurate. The end point refers to when there is a color change due to an indicator, which should correspond closely to the equivalence point but is based on a visible change rather than the actual stoichiometry.
Moreover, while the equivalence and end points are designed to be as close as possible, they are not necessarily at the exact same volume of titrant since the end point is a practical observation that depends on the indicator used. In summary, the equivalence point marks the stoichiometric neutralization of acid by base, while the end point is indicated by a color change in the titration mixture due to an indicator. Ideally, in well-designed titration procedures, the difference between the equivalence point and the end point is negligible.