Mai Lesson

Household pH Secrets

Science · 30 min · Ages 9-11 · Upper elementary · Away from the screen

This challenge tasks young scientists with creating a natural pH indicator from red cabbage to test various household liquids. They will classify liquids as acids or bases based on observed color changes. This hands-on activity encourages critical thinking and real-world scientific investigation.

What your child gets out of it

• Identify acids and bases using a natural indicator.
• Understand how a pH indicator works to reveal chemical properties.
• Conduct a simple, multi-step chemical experiment safely and accurately.
• Apply scientific observation and prediction skills to real-world substances.

What you need

• Red Cabbage — Shred and steep in hot water 10-15 min, then strain and cool before the lesson to make indicator liquid. (or Blueberries, Beetroot)
• Water — Needed for making hot water to steep the cabbage, and for test solutions.
• Clear Cups — At least 5-7 small cups are recommended for the indicator and each test liquid. (or Small Glasses)
• Spoon — For mixing and carefully adding test liquids.
• Knife — For safely shredding red cabbage.
• Cutting Board — For safely shredding red cabbage.
• Pot — To heat water and steep the shredded cabbage. (or Heatproof Bowl)
• Strainer — To separate the cabbage solids from the indicator liquid. (or Colander, Cheesecloth)
• Bowl — To collect the strained indicator liquid. (or Jar)
• Lemon Juice — One example of a common acidic liquid to test.
• Vinegar — One example of a common acidic liquid to test.
• Baking Soda — Mix a spoonful with water to create a basic solution for testing.

How it runs

1. Introduction · 5 min
2. Explore & Plan · 8 min
3. Discussion · 6 min
4. Activity · 9 min
5. Summary · 2 min