NEETChemistryRedox Reactions
What is the purpose of thiosulfate ions (S 2 O 3 2-) in iodometry?
Options
- ATo oxidize iodine to iodide ions.
- BTo reduce iodine to iodide ions.
- CTo form a blue complex with iodine.
- DTo stabilize Cu 2 I 2 precipitate.
Correct answer
B. To reduce iodine to iodide ions.
Step-by-step solution
Thiosulfate ions (S 2 O 3 2-) are used to reduce iodine (I 2 ) back to iodide ions (I-) in the reaction, effectively consuming the liberated iodine.