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Iodine Titration and Iron Tablets Quiz

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Questions and Answers

What is the reason for using iron tablets?

To enhance the absorption of nutrients

To ensure a measurable amount of iron (correct)

To provide a fast-release source of iron

To prevent iron deficiency anemia

What happens if starch is added at the beginning of the iodine titration?

It would react with sodium thiosulphate immediately

It would displace the iodine out of the titration (correct)

It will enhance color change visibility

It would not affect the titration process

What is the correct sequence of color changes in an iodine versus sodium thiosulphate titration?

Colourless to Blue Black to Red/Brown to Straw Yellow

Blue Black to Colourless to Straw Yellow to Red/Brown

Red/Brown to Straw Yellow to Blue Black to Colourless (correct)

Straw Yellow to Blue Black to Colourless to Red/Brown

Why is bleach diluted before titrating?

<p>To get a more accurate result when titrating</p> Signup and view all the answers

How is the dilution factor determined?

<p>Diluted volume divided by initial volume</p> Signup and view all the answers

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.