Product Overview

Iodine Resublimed 99.8% AR (CAS No. 7553-56-2) is high-assay molecular iodine purified by resublimation for analytical-reagent use. Its reversible reduction to iodide and quantitative reaction with suitable reducing species form the basis of classical iodine/thiosulfate and iodometric analytical chemistry. In iodide-containing solutions, molecular iodine also establishes triiodide equilibria that facilitate preparation of homogeneous titration reagents.

The AR grade is intended for preparation and standardisation of iodine-containing analytical solutions, redox titrations and method verification. Resublimed iodine has established use in standardisation of sodium thiosulfate solutions and in quantitative oxidation–reduction procedures where accurately characterised iodine reagent is required.

Typical Applications

• Preparation of iodine analytical titrant solutions
• Standardisation of sodium thiosulfate solutions by established procedures
• Iodimetric determination of suitable reducing substances
• Iodometric redox method verification
• Preparation of iodine–iodide analytical reagent solutions
• Investigation of iodine/thiosulfate reaction stoichiometry
• Laboratory quality-control procedures involving molecular iodine

Common Synonyms

• Iodine
• Molecular iodine
• Diiodine
• Diatomic iodine
• Sublimed iodine
• Iodine crystals

Storage Conditions

Keep tightly closed and protected from direct light and excessive heat to minimise sublimation and loss of iodine. Use clean analytical sampling equipment and limit exposure to open air so that assay and redox reagent quality are preserved.