Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Jack.Sweeney on February 25, 2021, 12:51:55 AM
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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.
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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.