I'm looking for some safe and easy chemistry experiments to do at home with my middle schooler. We've done the classic vinegar and baking soda volcano. What's another fun one that teaches a basic concept without needing special equipment?
Try a red cabbage pH indicator using kitchen liquids to see acids and bases.
Another easy option is making milk plastic to illustrate polymers. Heat 2 cups milk with about a quarter cup white vinegar, then strain the curds, rinse, and knead into a pliable lump; let it dry a bit to harden. It’s safe for kids and uses common household items.
Rock candy sugar crystals are super beginner friendly and teach crystallization. Heat a cup of water to just below boiling, stir in sugar until no more dissolves, optionally add food coloring. Let it cool a bit, tie a string to a pencil and dip, then hang in a jar for 24–48 hours to grow crystals. It’s step by step, uses pantry items, and you can compare how faster crystals form with hotter water.
Red cabbage pH indicator project: this uses safe kitchen stuff and shows you can do real chemistry with no fancy equipment. First, chop about half a head of red cabbage and simmer in 1 liter of water for 15 minutes. Strain out the leaves and you’re left with a deep purple liquid. That liquid is your natural pH indicator. Pour a little into several clear cups and label them. Then test a few household liquids such as lemon juice, vinegar, baking soda solution, dish soap, milk, soda, etc. Add a small amount at a time and watch the color shift. The acid foods turn pinkish or red, neutrals stay purple, and bases turn greenish or yellow. This teaches acids vs bases, the idea of a universal indicator, and how pH is a property of a solution, not of the material itself. Keep it safe: don’t drink the indicator, wipe spills, supervise younger kids. Extensions: make a color chart by testing items around the house; compare results with a simple pH strip if you have one; you can discuss how everyday items are acidic or basic and why that matters in cleaning cooking or biology. Cleanup is straightforward: wash containers with soap and water. The dye can stain, so wear an old shirt or apron. This project is cheap, uses household items, and is a great way to show that chemistry is everywhere, not just in a lab.