As the saying goes, science is never ending. People will continue to discover, continue to study, and then continue to draw conclusions. Finally, let future generations learn from the experiments that predecessors have discovered and continue to study them. This time in our science class, the teacher did such an interesting experiment for us

The teacher asked us to prepare purple cabbage and then do the experiment a week ago. The teacher did not tell us the details. , so we have been looking forward to it for a whole week.

On Friday, we still lined up and went downstairs in an orderly manner. When we arrived at the laboratory, a pungent smell spread out, which made us cover our mouths and noses, and we felt much better when we opened the windows. This is when the teacher came to the classroom with a science textbook under his arm, tapped it with a lab stick, and it soon became quiet. "Ahem, only one classmate brought purple cabbage this time, but actually only a few slices were enough, but that classmate brought a whole one and he will definitely not be able to use it all this time, but don't use too much, and you have to give it back to others. Okay, let’s start the experiment. First, I want to tell you about the materials. A plastic bag, 3 to 4 pieces of purple cabbage, and a pair of hands are enough. Material clerk, bring up the materials." I walked up quickly. , because I am a materials person, I don’t understand, why do you need a pair of hands? The answer was soon revealed. It turned out that the task given to us by the teacher was to smash a few pieces of purple cabbage with our hands, that is, to destroy it. We liked this the most, and we quickly got into the mood. I took the lead, picked up my hands, and pounded the purple cabbage. Several "bang bang bang" sounds were heard in our classroom, and the cleaning aunt came to see what we were doing. Soon our few slices of cabbage turned into a bag of shredded vegetables. We poured the juice into the test cup, slowly half a cup, 250ml. What a terrifying fighting power. It was frightening. It took a few seconds to hammer out the pieces. Half a cup slowly. I could look at other people's cups. I was shocked. Half-full cups and half-cups were everywhere. I suddenly felt that we were "exploding" weak. So I decided to further squeeze the dregs. "Boom! Boom! Boom!" I think the teacher borrowed a hammer, hammered it, and squeezed out another half cup. We took our trophies and shouted to the teacher, "Teacher, the beating is over." "Put it away on the table, it's a mess." Our table was full of debris. We wiped it with a rag for a long time, and the table was all messed up by us. Purple

Finally, the teacher told us that this is called purple cabbage test solution, which is mainly used to test acidity and alkalinity. For example, if white vinegar is added to the purple cabbage test solution, it will turn red, which is acidic; another example is lime water, which will turn yellow-green, which is alkaline; and another is neutral, and will become purple after adding it. This is the magic. You can also use acidity and alkalinity to make all kinds of fun things, which is very interesting.

This experiment was interesting and I learned something, great!