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Turmeric as a Natural Indicator Video Lecture | Science Class 7 (Old NCERT)
FAQs on Turmeric as a Natural Indicator Video Lecture - Science Class 7 (Old NCERT)
| 1. What is a natural indicator? |  |
A natural indicator is a substance derived from plants or other organic sources that can be used to determine the pH level of a solution. It changes color depending on whether the solution is acidic, neutral, or basic.
| 2. How does turmeric act as a natural indicator? | |
Turmeric contains a compound called curcumin, which is responsible for its yellow color. When turmeric is added to an acidic solution, the curcumin molecules change their structure and exhibit a red color. In a basic solution, the curcumin molecules change back to their original structure, resulting in a yellow color.
| 3. What are the advantages of using turmeric as a natural indicator? | |
Using turmeric as a natural indicator has several advantages. Firstly, it is easily available and inexpensive. Secondly, it is safe to handle and non-toxic. Additionally, turmeric is stable and can be stored for a long time without losing its effectiveness as an indicator.
| 4. How can turmeric be used as a natural indicator in class 7 experiments? | |
To use turmeric as a natural indicator in class 7 experiments, a small amount of turmeric powder can be added to different solutions with varying pH levels. The color change of the turmeric can then be observed and compared to a color chart to determine the pH of each solution.
| 5. Can turmeric be used to test the pH of any type of solution? | |
Turmeric is most effective in testing the pH of aqueous solutions, such as water-based liquids. It may not work as well with non-aqueous solutions or solutions that contain other colored compounds that could interfere with the color change of the turmeric.
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