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Baking soda. Red Cabbage (or you can make the juice yourself to save time, see Step 5a) Litmus paper. pH meter. Various household materials to test pH levels (lemon juice, orange juice, ammonia, milk of magnesia, water, vinegar, and baking soda mixed with water) Cotton swabs. White paper. Construction paper. Paper Towels. Sticks for stirring ... ................
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