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Learners investigate signs of a chemical reaction when they mix vinegar and baking soda. In addition to a gas being produced, learners also notice the temperature decreases.

Learners make their own acid-base indicator from red cabbage. They use this indicator to test substances around the house.

This activity uses turmeric, a common spice in curry, as an indicator for acidity and basicity. Turmeric is yellow in acid and neutral substances, but turns bright red with bases.

In this introductory activity and demonstration, learners are introduced to the concept that different substances react chemically in characteristic ways.