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The reaction between iodine and starch is complete after a certain period of time, typically around 2-4 minutes. Once all the available starch molecules have formed a complex with iodine, there are no more free starch molecules for the iodine to react with, resulting in the iodine solution no longer turning blue.

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Why did the the mixture stop turning the drops of iodine solution blue after 240 s?

The mixture stopped turning the drops of iodine solution blue after 240 seconds due to the completion of the reaction between iodine and the other components in the mixture. Once all the iodine had reacted, there was no more available iodine to cause the blue color change.


Why was the mixture stop turning the drops of iodine solution blue after 240 s?

The reaction between iodine and starch forms a blue-black complex. Once all the starch present in the solution has reacted with the iodine, no more blue color will be observed. This explains why the mixture stopped turning the drops of iodine solution blue after 240 seconds.


Why did the mixture stop turning the drops of iodine solution blue after 240s?

Because it didn't react with the iodine, i don't know


Why did the mixture stop turning the drops of iodine solution blue after 240 s?

Because it didn't react with the iodine, i don't know


Is tincture of iodine a homogeneous mixture?

Tincture of iodine is a homogeneous solution.


What kind of mixture is tincture of iodine?

This tincture is a homogeneous solution.


Is iodine and water homogeneous or heterogeneous?

They are homogeneous. But they are not a mixture, so they are a pure substance


Why does a mixture of enzyme stop turning the drops of iodine soloution?

When a mixture of enzymes stops turning drops of iodine solution, it is likely because the enzyme has catalyzed the reaction that converts starch into glucose, which iodine detects by changing from a blue-black color to a brown or yellow color. Once all the starch has been broken down into glucose, there is no longer any substrate for the iodine to react with, so it remains in its original blue-black color.


What is the term used to describe a solution composed of iodine and water?

A mixture.


What is the difference between iodine crystals and iodine solution?

Iodine crystals are solid, crystalline form of elemental iodine, while iodine solution is a liquid mixture of elemental iodine and either alcohol or water. Iodine crystals are typically used for storage and long-term preservation, while iodine solution is commonly used for disinfection and medical purposes.


How do you prepare iodine solution?

To prepare iodine solution, dissolve iodine crystals in a mixture of water and potassium iodide (KI). The ratio of iodine to KI will determine the concentration of the solution. The solution should be stored in a dark bottle to prevent degradation from light exposure.


How is iodine solution prepared?

Iodine solution is typically prepared by dissolving iodine crystals in a mixture of potassium iodide and distilled water. The potassium iodide acts as a stabilizer for the iodine. The final concentration of iodine in the solution can vary depending on its intended use.