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What is the purpose of sodium thiosulfate in a clock reaction?? watch
- Thread Starter
- 01-02-2017 19:25
- 01-02-2017 19:31
It takes up the iodine produced. Once its used up, the iodine can react with other iodine ions to form a complex with starch- solution turns dark. By knowing how much thiosulhate you have, you can also determine the rate of reaction.
- 01-02-2017 19:32
it turns iodine into iodide ions, then when all the sodium thiosulfate has reacted with the iodine, as soon as the new iodine forms it can react with the starch giving a sharp colour change.
- 01-02-2017 19:36
essentially it delays the starch reacting with the iodide so you can time the initial rate of reaction i think