The acid-base test shows that students in grade-1 will introduce acidic and alkaline liquids and pass this simple test. The purple cabbage in the transparent plastic cup has a rough head. Spoon paper towels * Safety glasses White vinegar ammonia method can do this as a demonstration or grouping in class. Pay special attention to ammonia, pass. Put the chopped cable into 1/2 pot of water and boil for about ten minutes. Be extra careful with ammonia, but. Put 1/2 chopped Chinese cabbage in a water pot and cook for about 10 minutes. Filter and refrigerate until it can be used. Pour each liquid into about half of the cup. Add a cup of boiled cable to each cup. Filter and refrigerate until it can be used. Fill about half of each cup with liquid. Add a teaspoon of boiled cabbage to each cup. What happened? Cabbage should change color: vinegar-red-acidic ammonia-green-alkaline water-purple-neutral. According to these color changes, try to predict when other liquids are acidic or alkaline, and then add them to the cooked bag. What happened? The color of Chinese cabbage should be changed: vinegar-red-acidic ammonia-green-alkaline water-purple-neutral. According to these color changes, predict whether other liquids are acidic or alkaline, and then add boiled Chinese cabbage. Extension: Make your own index paper. Soak the paper tower or white coffee filter in purple bag juice. Dry and cut into strips. Extension: Make your own test paper. Paper towels or white coffee filter paper soaked in purple cabbage juice. Dry and cut into small pieces. The test paper will change color according to the type of liquid it is immersed in. If it's good, I might add that the Gaza area should change color according to the entry of liquid. Well, I'll add the type of decline,