What is the indicator used in the titration of peroxides to determine the peroxide value and what is the color at the endpoint?
Understand the Problem
The question is asking about the specific indicator used in the titration of peroxides and its corresponding color at the endpoint. It involves knowledge of chemistry and the properties of titration indicators.
Answer
Starch, colorless
The indicator used is starch, and the color at the endpoint is colorless.
Answer for screen readers
The indicator used is starch, and the color at the endpoint is colorless.
More Information
In the titration process, peroxides in the oil oxidize iodide ions to iodine. The iodine then reacts with the starch indicator, which turns from blue to colorless at the endpoint when titrated with sodium thiosulfate.
Tips
A common mistake is to confuse the initial color change with the endpoint. It's essential to titrate until the color completely disappears.
Sources
- Vitas Analytical Applications - vitas.no
- How can I deal with most common issues on peroxide value titration? - researchgate.net
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