This project involves extracting pigments from plants to create natural pH indicators. You will test various substances to see how they affect the color of your indicators.
If natural indicators are used, then they will change color when exposed to acidic or basic substances.
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Chop the red cabbage into small pieces.
Boil the cabbage in water for 30 minutes to extract the pigment.
Strain the mixture to collect the liquid indicator.
Prepare different household liquids in beakers.
Add a small amount of the cabbage indicator to each beaker.
Observe and record any color changes.
Use pH strips to confirm the acidity or alkalinity.
Clean up the workspace following the experiment.
The cabbage indicator is expected to change color based on the pH of the liquids, turning red in acids and green/yellow in bases.
Type of household liquid
Color change of the indicator
Volume of indicator used, Temperature of liquids, Amount of cabbage used
Handle boiling water with care and wash hands after handling plant materials.
Use visuals to show color changes.
Create a chart of pH levels and corresponding colors.
Discuss the importance of pH in biological systems.
Demonstrate the indicator with various household liquids.
A pH indicator is a substance that changes color depending on the pH level of a solution.
Yes, many plants can be used, such as beetroot and hibiscus.
The pH scale ranges from 0 to 14, with 7 being neutral; lower values are acidic and higher values are basic.
