Question

what is the end point in a titration? the point where the indicator changes color. the point where moles of acid equal moles of base. the point where the burette is emptied. the point where the reaction is complete.

Explanation:

In titration, the endpoint is defined as the point where the indicator changes color, which is used to visually signal that the titration reaction (like acid - base neutralization) has reached a stage where we can stop adding the titrant. The point where moles of acid equal moles of base is the equivalence point. The burette being emptied is not related to the endpoint concept, and the reaction being complete is a vague description compared to the indicator - based definition of the endpoint.

Answer:

A. The point where the indicator changes color.