Issues with using iodine solution to titrate sodium thiosulfate

2020-12-18View Original

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The sodium thiosulfate solution was titrated with an iodine solution; one sample was pure sodium thiosulfate solution, while the other was a mixture of sodium thiosulfate and sodium thiocyanate. The concentration of sodium thiosulfate is the same in all cases. However, the titration results showed that the amount of iodine solution consumed by the pure sodium thiosulfate solution was greater than that consumed by the mixture of sodium thiosulfate and sodium thiocyanate. Is it a reaction between sodium thiocyanate and sodium thiosulfate? It is still a reaction between sodium thiocyanate and the buffer (the pH of the buffer is 6, and it is prepared from glacial acetic acid and sodium acetate)

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Issues with using iodine solution to titrate sodium thiosulfate

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