I want the explanation on the activity based on reaction of acids and bases with metals
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Answer:
Because acids and bases pop up all over the place in nature, as well as in plenty of human-made settings, what are some fun and interesting ways to play with these ideas? As it turns out, there are plenty. Try this experiments to get everyone interested in the ideas of acids and bases.
1. The Red Cabbage pH Test
Red cabbage is a great natural indicator and is perfect for use in classroom experiments. To get this test started, slice some red cabbage, put it in a pot with some water and let it simmer for 30 minutes or so. Strain the liquid out, set it aside and then you’re all ready to get started.
Grab a couple of small rectangles of white paper. Index cards are a great choice, but you can also cut out regular pieces of scrap paper. Soak them in the red cabbage water and let them dry.
Take a white paper plate or a thick sheet or white paper and drip a few drops of your cabbage water onto this surface. Take an acid, such as lemon juice, and a base, such as baking soda, and add a small amount into different sections of your cabbage water samples. The water will change color as a result and will look like magic in the process. With a solid explanation of bases and acids under their belts, kids will enjoy watching the colors change in response to the different liquids.
Another way to use this cabbage water is to pour a few inches of it in two separate glasses. Add water to these glasses as well, until they’re about two-thirds of the way full. Finally, add a base to one glass and an acid to the other and watch the entire glassful of liquid change colors.
Once your homemade litmus papers are dry, cut them into smaller strips. Now the kids can perform their very own litmus tests with all kinds of different materials and substances. Pull different things out of the fridge and let the kids use the papers to test them. Some good things to try include pickle brine, apple juice and soda. Before you dip the papers into the substances, ask the kids to guess whether an item will be acidic or basic, and make a game out of it. Show them how to record their predictions, along with whether or not they were correct.
Of course, if red cabbage is unavailable or if you’d rather not go through the process of creating your own litmus papers, you can simply buy prepared litmus papers in many different stores. These pre-made papers will work in exactly the same way and can be used to perform the same tests.
2. The Raw Egg Experiment
Another great experiment to try involves a raw egg. While this one is fun to do and fun to watch, the kids might also enjoy making predictions with this one and trying to guess what will happen.
For this experiment, keep things simple. Take a raw egg and submerge it in a bath of vinegar. Ask the kids what they think will happen. As you might be able to guess, the highly acidic vinegar breaks down the shell and effectively turns it into an acid-cooked soft-boiled egg. It will even bounce if you drop it carefully.
Thank you!