Understanding acids, bases, and salts is a fundamental part of Class 7 Science. These concepts not only form the basis for many advanced topics but also have practical applications in daily life. To make learning these concepts enjoyable and hands-on, here are some simple science projects that students can do at home with easily available materials.

1. Lemon Juice and Baking Soda Volcano

Materials Needed:

• Lemon juice (acid)
• Baking soda (base)
• A container

Procedure:

• Place a few teaspoons of baking soda in the container.
• Slowly pour lemon juice over the baking soda.
• Watch the reaction as it fizzes and bubbles, simulating a volcanic eruption.

What’s Happening?

The acid (lemon juice) reacts with the base (baking soda) to produce carbon dioxide gas, which creates the bubbling effect. This experiment demonstrates a classic acid-base reaction.

2. Homemade pH Indicator with Red Cabbage

Materials Needed:

• Red cabbage
• Water
• Various household liquids (vinegar, baking soda solution, soap water)
• Transparent cups

Procedure:

• Chop the red cabbage and boil it in water for about 15 minutes.
• Strain the liquid into a clear container to obtain your pH indicator.
• Pour the indicator into several transparent cups.
• Add different household liquids to each cup and observe the color changes.

What’s Happening?

Red cabbage contains a pigment called anthocyanin, which changes color when it comes into contact with acids or bases. This natural pH indicator can help identify whether a substance is acidic, basic, or neutral.

3. Cleaning Coins with Salt and Vinegar

Materials Needed:

• Dirty rupee coins
• Vinegar (acid)
• Salt
• A bowl

Procedure:

• Mix 1/4 cup of vinegar with 1 teaspoon of salt in a bowl.
• Place the dirty coins into the mixture.
• After a few minutes, observe how the coins become shiny.

What’s Happening?

The acid in the vinegar reacts with the salt to form a weak hydrochloric acid, which dissolves the copper oxide tarnish on the coins, making them shiny again.

Conclusion

Exploring acids, bases, and salts through simple home experiments helps Class 7 students understand their properties and everyday applications. These hands-on activities make learning fun and engaging, reinforcing key concepts in CBSE Science. At ConnectEd, we believe in empowering students with practical knowledge and fostering a lifelong curiosity in science.