MCQ
Which titrant is used in the Iodometric titration which involves $\ce{I_2} ?$
- A$\mathrm{KMnO}_4 $
- B$ \mathrm{~K}_2 \mathrm{Cr}_2 \mathrm{O}_7 $
- ✓$ \mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3$
- DAll of them
✓
Answer
Correct option: C.
$ \mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3$
Iodometry is one of the most important redox titration methods. Iodine reacts directly, fast and quantitively with many organic and inorganic substances.
Thanks to its relatively low, $\ce{pH}$ independent redox potential, and reversibility of the iodine/ iodide reaction, iodometry can be used both to determine amount of reducing agents $($by direct titration with iodine$)$ and of oxidizing agents $($by titration of iodine with thiosulfate$).$
Thanks to its relatively low, $\ce{pH}$ independent redox potential, and reversibility of the iodine/ iodide reaction, iodometry can be used both to determine amount of reducing agents $($by direct titration with iodine$)$ and of oxidizing agents $($by titration of iodine with thiosulfate$).$
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