In titrations using acidified permanganate, what is not required?

In titrations involving acidified permanganate, the key point is that permanganate itself can act as its own indicator, showing a distinct color change when it is reduced. In acidic solutions, permanganate is a deep purple color, and as it is reduced during the titration, it can turn from purple to colorless, indicating the end-point. This inherent characteristic of permanganate eliminates the need for a separate indicator.

Water is necessary to dilute the permanganate solution or to adjust concentrations for the titration process. A strong acid, such as sulfuric acid, is also required to maintain an acidic medium, which is essential for the proper functioning and accurate reaction of permanganate, as it only reacts effectively in acidic conditions. While a thermometer can be useful for monitoring temperature effects in some titrations, it is not a standard requirement for titrations using permanganate, as the reactions typically occur at ambient temperatures without significant thermal variation affecting the outcome.

Thus, the reasoning behind selecting that no separate indicator is required is founded on the unique properties of permanganate in acidified conditions, where it visibly indicates the progression and completion of the titration itself.