Questions and Answers
What is the reason for using iron tablets?
What happens if starch is added at the beginning of the iodine titration?
What is the correct sequence of color changes in an iodine versus sodium thiosulphate titration?
Why is bleach diluted before titrating?
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How is the dilution factor determined?
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Study Notes
Iron Tablets and Iodine
- Five iron tablets are utilized to guarantee a measurable iron concentration during experiments or treatments.
- Pure iodine is avoided because it sublimes (transitions from solid to gas) at room temperature, making it difficult to measure accurately.
Iodine vs. Sodium Thiosulphate Titration
- The color change during iodine titration proceeds from red/brown to straw yellow, then to blue-black, and finally to colorless.
- Starch is added to the iodine titration once the solution changes to straw yellow to enhance visibility of the endpoint.
Starch Addition in Iodine Titration
- Starch cannot be added at the beginning of the iodine titration as it would displace iodine, affecting the accuracy of the measurement.
Bleach Dilution Before Titration
- Bleach is diluted prior to titration to achieve more reliable and precise results.
- The dilution factor is calculated by dividing the diluted volume by the initial volume to determine the concentration change.
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Description
Test your understanding of iodine titrations and the role of iron tablets in chemistry. This quiz covers color changes during titrations and the proper procedures, including the timing for adding starch. Ideal for chemistry students looking to reinforce their knowledge.
