Iodine titration can be iodemotric or iodimetric depending on using iodine directly or indirectly is an oxidising agent in the redox titration. a. Iodimetric titration in which a standard iodine solution is used as an oxidant and iodine is directly or indirectly titrated against a reducing agent. For example. `2CuSO_(4)+4KJtoCu_(2)I_(2)+2K_(2)SO_(4)+I_(2)` b. Iodimetric procedures are used for the datermination of strength of reducing agent such as thiosulphates, sulphites, arsenties adn stanous chloride etc. by titrating them against standard solution of iodine in a burette. `2Na_(2)SO_(3)to2 NaI +Na_(2)S_(4)O_(6)` Starch is used as indicator near the end point whilch form blue colour complex with `I_(3)^(-)`. The blue colour disappeams when there is not more of free `I_(2)` . In the relation `2CuSO_(4)+4KI+Cu_(2)I+(2)+2K_(2)SO_(4)+I_(2)` the equivalent weight of `CuSO