【正确答案】The end point is the point at which the titration is stopped. The equivalence point is the point at which the acid and the base( or oxidizing agent and reducing agent)has been added in equivalent quantities. Since the purpose of the indicator is to stop the titration close to the point at which the acid and base were added in equivalent quantities, it is important that the equivalent point and the end point be as close as possible. The indicator must change color at a pH close to that of a solution of the salt of the acid and base.