Which of the following titrants would most likely be used as ths' own indicator in acid medium?
Correct answer: C. KMnO4 (Potassium permanganate)
- A. K2Cr2O7 (Potassium dichromate)
- B. Iodine (I2)
- C. KMnO4 (Potassium permanganate)
- D. H2O2 (Hydrogen peroxide)
Explanation
Potassium permanganate (KMnO4) is used as its own indicator because it changes color distinctly at the endpoint of a titration in an acidic medium. The intense purple color of KMnO4 fades to colorless (or a very faint pink) as it is reduced, providing a clear visual cue without the need for an additional indicator. In contrast, K2Cr2O7, Iodine, and H2O2 lack such a distinct color change when used in acidic conditions, making them unsuitable as self-indicators.
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