Standardization of thiosulfate with potassium dichromate reaction
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Sodium thiosulfate is often standardized with potassium dichromate. In the standardization, iodine (triiodide) liberated by potassium dichromate in an acidic potassium iodide solution is titrated with a sodium thiosulfate solution. The iodine liberation process significantly affects the titration results.
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The oxidation number of chromium in potassium dichromate is +6
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