Science activity
Magic Potions: Color-Mixing Lab
Be a potion-maker! PREDICT what color you'll get when you mix two potion bases with food coloring. Try water, tea, lemon juice, and oil as your potion bases.
Materials and setup
- red cabbage
- vinegar
- baking soda
- lemon juice
- dish soap
- cups
- food coloring
- tray
- spoons
- paper
- markers
How this changes by age
Pre-K (ages 3–4)
Be a potion-maker! PREDICT what color you'll get when you mix two potion bases with food coloring. Try water, tea, lemon juice, and oil as your potion bases.
Steps
- Set up 4 clear cups on a tray. Pour a different liquid into each: water, cooled tea, lemon juice, cooking oil.
- Add 3 drops of one color (e.g., yellow) to each cup. Notice: which liquids let the color spread? Which one keeps the drops as little balls? (Oil!)
- Color-mixing potions: into a fresh empty cup, add 5 drops blue. PREDICT: 'If I add yellow, what color will I get?' Then add 5 drops yellow. (Green!)
- Repeat with red+yellow (orange) and red+blue (purple). Always predict before mixing.
- Make a 'rainbow potion shelf': line up cups showing red, orange, yellow, green, blue, purple. Talk about which colors came from mixing which.
- Tell a grown-up one thing that surprised you.
- Before/after drawing: sketch the bowl before mixing and after.
Learning objectives
- Predict the result of mixing two primary colors
- Notice that different liquids (water, tea, oil) behave differently with color
- Use describing words for colors and how they change
Kindergarten (ages 5–6)
Become a kitchen chemist! Make a cabbage juice indicator that changes color with different liquids. Test household substances to discover which are acids and which are bases.
Steps
- Make cabbage juice indicator: boil half a head of red cabbage in water for 15 minutes (parent does this). Strain and cool the purple liquid.
- Pour small amounts of cabbage juice into 6 cups.
- Add different liquids to each cup: vinegar, lemon juice, baking soda water, soap water, milk, soda.
- Watch the color changes! Pink/red = acid, blue/green = base, purple = neutral.
- Sort your cups into three groups: acids (turned pink), bases (turned green), and neutral (stayed purple).
- Draw your results showing each cup's color and label it acid, base, or neutral.
- Tell a grown-up one thing that surprised you.
Learning objectives
- Use a natural indicator to test whether substances are acids or bases
- Classify household liquids as acids, bases, or neutral
- Observe and record color changes as evidence of chemical properties
Early elementary (ages 6–8)
Investigate acid-base chemistry systematically: create a pH indicator, test and rank household substances by acidity, explore neutralization reactions, and write a chemistry lab report.
Steps
- Make red cabbage juice indicator (see parent instructions). This indicator changes color across the pH scale: red (strong acid) to pink to purple (neutral) to blue to green (strong base).
- Test at least 10 household substances: vinegar, lemon juice, orange juice, milk, water, baking soda solution, soap, bleach solution (parent handles), antacid tablet in water, and soda.
- Create a pH scale chart (1-14). Place each tested substance at its estimated pH based on the color it turned the indicator.
- Explore neutralization: slowly add vinegar (acid) to baking soda water (base) with indicator. Watch the color change as the acid neutralizes the base!
- Research: Why is stomach acid important for digestion? Why do antacids work? How does acid rain damage buildings?
- Write a lab report: Question, Hypothesis, Materials, Procedure, pH Results Chart, and Conclusion about acids and bases in everyday life.
- In one sentence, tell a parent or sibling what surprised you today.
Learning objectives
- Create and use a natural pH indicator to estimate acidity and alkalinity
- Rank household substances on a pH scale based on experimental evidence
- Demonstrate and explain neutralization reactions between acids and bases
Upper elementary (ages 8–10)
Conduct advanced acid-base chemistry experiments: quantify pH precisely, perform titrations, study buffer solutions, and research industrial and biological applications of acid-base chemistry.
Steps
- Create a calibrated cabbage juice pH scale: test substances with known pH values (vinegar ~2.4, lemon ~2, water ~7, baking soda solution ~9, ammonia ~11). Photograph or draw the exact color for each pH level.
- Perform a titration: slowly add vinegar drop by drop to a measured amount of baking soda solution with indicator. Count drops until the color changes to neutral. This tells you the exact ratio needed for neutralization.
- Investigate buffer solutions: add vinegar to plain water vs. water with dissolved antacid tablet. Which resists pH change better? Buffers resist pH changes — this is how blood maintains stable pH.
- Research the chemistry: acids donate H+ ions, bases accept H+ ions. The pH scale measures H+ concentration logarithmically (pH 3 is 10x more acidic than pH 4). Write a paragraph explaining this.
- Research applications: acid-base chemistry in cooking (why does baking soda make batter rise?), agriculture (soil pH for different crops), medicine (antacids, blood pH), and industry (water treatment).
- Write a comprehensive chemistry paper: cover pH theory, your experimental results with calibrated measurements, titration data, buffer investigation, and real-world applications.
- In one sentence, tell a parent or sibling what surprised you today.
Learning objectives
- Perform a titration and determine the neutralization ratio of an acid and base
- Explain pH as a measure of hydrogen ion concentration on a logarithmic scale
- Investigate buffer solutions and explain their importance in biological systems
Safety and evidence note
Read the full activity before beginning. An adult should supervise tools, heat, food, outdoor work, movement, and experiments as appropriate. Completion records that the activity was done; the child’s explanation, work sample, photo, or demonstration is stronger evidence of learning than a completion check alone.
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