Check out my video: https://youtu.be/dWgqyKk1sQ4
Our 6th graders have been learning about chemical reactions – how substances change to form new substances, with different properties. We combined some substances, and looked for evidence that a chemical reaction might have taken place, like color changes. We used the juice of red cabbages as an indicator, which means it changes color when the properties around it change. This is something you can do in your kitchen at home. First, you need to boil the leaves of about a quarter of a head of red cabbage in a small amount of water. It will give off a strong smell. Boil it until the water turns purple. Let it cool, then chop the leaves and the colored water in a blender or food processor. Strain it, save the colored water, and throw away the solids. This is your cabbage juice, and can be stored in the refrigerator for a few days. Put a little cabbage juice in some clear cups and you are ready to start testing. Add a spoonful of lemon juice to one cup, and vinegar to another, and baking soda to a third. Did you get a color change? Lemon juice and vinegar contain acids, which have a low pH, meaning they have a higher concentration of hydrogen atoms. Cabbage juice will change to different colors, depending on the pH of what you add to it. More red means lower pH, and more blue means higher pH. If you try this, please let me know in the comments, and don’t forget to take pictures of your colorful results.
Check out my video: https://youtu.be/dWgqyKk1sQ4
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