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Embed code for: Cabbage juice experiment
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Cabbage juice experiment: acid/base indicator
Policy maker: Alicia
Members: Alicia Simon Ziv
Date: Wednesday, November 4th, 2015
This experience is about the indicator reaction of acid and bases. There’s some problems need to be solved :Why is color changing when contact the acid or bases ,what’s the different ？ We thought that the acid or base can affect the indicator into different color, when they touching ， the ionization happened so they can bonded with other ionic so the color is changing. We predict that the acid and bases have different property
The materials we used in this experience: a purple cabbage, water, a blender, 5cups, a knife, a bottle of orange juice, one lemon, a bottle of white vinegar, soap, and backing soda. The cabbage juice is the indicator. The orange juice, lemon juice, vinegar is for acid. Soap, backing soda is for bases. Blender can help us make the purple cabbage into juice and knife can help us to cut. The 5 cups are using for carry the juice.
Now is the procedure of the experience. First, we need to cut the purple cabbage and put the pieces into the blender. Add some water, switch on the blender, you will get cabbage juice soon. After that ， pour the cabbage juice into 5 cups, there’s no need to be the same volume. Secondly, add the object into the cabbage juice. Start with the acid. We use lemon squash, orange juice and the white vinegar. In cup 1, the color became to a color of rose, dark red. For the cup 2, the changing is not so obvious than the red one. it’s become a dark purple color. The color of the cup 3 is as same as the No.1, so it’s mean that the content of acid in the orange juice is not as much as the lemon and white vinegar. But the Ph. Of the lemon and vinegar are similar. Then add the bases. In cup 4, when adding the backing soda, after mixing, the color will be the light green. About the cup 5, it’s difficult to make the soap become liquid, so I take a long time try to cut it, but it’s failed, so we just put all the soap in the juice and mix it. It turns blue soon. Finally, we can check our work and start to record them and clean all the stuff. The result of the experience is in the chart below
As shown in this table, you will get that when you mix the cabbage juice with the acid like orange juice, lemon juice, vinegar. You will get the color like red or pink.
When you mix the cabbage juice with the base like soap or backing soda. You will get color like green or blue. You can see that the color of 1, 2,3is in one kind, so as the 4, 5.We can get that the acid and bases have a different chemical property.
Based on the result of the experience, Acid mix with the Indicator can get a warm color .Base mix with the indicator will get a cool color.
There is still some error in this experience. Such as we didn’t filter the cabbage juice in the blender, so there will be some dregs in the juices. If we improve that, the color can be clearer to see the changing color. Also we didn’t bring the stirring rod. We just use knife, that’s dangerous and not good, we will be careful next time. Soap is also a problem because it’s not a liquid. If I can redo the experience, I will change something else but the Ph. is still similar.
That’s all our groups report. We will benefiting from experience and take this activity as a lesson. In the future ， we will do better. Thank you.