An indicator can help determine if a substance is starch by changing color in the presence of starch. There are specific indicators that react with starch and produce a color change. One common indicator for starch is iodine solution.
To identify if a substance contains starch using an indicator:
1. Take a small amount of the unknown substance.
2. Place the sample in a test tube or a petri dish.
3. Add a few drops of iodine solution to the sample.
4. Observe any color changes that occur.
If the substance contains starch:
- It will turn from its original color to a dark blue or black color in the presence of iodine solution.
- The color change occurs due to the formation of a complex between iodine and starch molecules.
If the substance does not contain starch:
- There will be no color change or any noticeable reaction with the iodine solution.
- The sample will retain its original color.
By using an indicator like iodine solution, scientists can quickly and easily determine the presence or absence of starch in an unknown substance.
When performing a scientific investigation on an unknown substance how can an indicator help you determine if the substance is starch
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