Back titration is a titration in which a known excess of standard reagent is added to the solution and the excess is titrated instead of the original sample. Back titration is used when direct titration is not possible due to the slow reaction between analyte and titrant.
Titrate an iodine solution with a thiosulfate solution or another compound that will be reduced by iodine in direct iodometric titration. Alternatively, we can use an iodide (I) solution that has been oxidized by a stronger oxidant than iodine.
Back titration involves allowing excess iodine to react with the analyte, such as acetone, and then determining the excess amount of iodine used by titration with thiosulfate. Because we know how many moles of iodine we've added and how many haven't reacted, determining how many moles have reacted and, ultimately, determining how many analytes were present is simple.
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