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Topic: Starch Iodine Complex  (Read 607 times)

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Offline Jack.Sweeney

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Starch Iodine Complex
« on: February 25, 2021, 12:51:55 AM »
Currently doing a practical report on an Indirect titration to determine the concentration of a bleach sample. But iodide was used to convert the hypochlorite into chloride. And I wanted to know the effect of the reaction when using starch as an indicator for the excess amount of iodide.

My main question: Is there a chance that iodine molecules can get stuck in the starch iodide complex? And if they do, are they able to react with other chemicals.

As this would be a error that would occur in each trial but to a different extent. For determining the end-point of the reaction between iodide and our standard solution of sodium thiosulfate.
« Last Edit: February 25, 2021, 03:40:41 AM by Jack.Sweeney »

Offline chenbeier

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Re: Starch Iodine Complex
« Reply #1 on: February 25, 2021, 03:22:53 AM »
Quote
But iodide was used to convert the hypochlorite into chlorine

This is wrong. It get converted to  chloride.

The iodometric titration is a common method. The starch didnt disturb it.

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