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    COSI
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    In this chemistry activity, learners will test the pH of various foods and household substances using cabbage. They will explore the concept of acidic and basic chemicals, learn that pH is a common...

    $5 - $10 per group Ages 8 - 11 10 to 30 minutes
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    Sciencenter
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    In this chemistry challenge, learners combine acids and bases in a universal indicator to create five different colors. Using vinegar, washing soda, and Bogen universal indicator, the goal is to...

    Over $20 per group Ages 4 - 14 10 to 30 minutes
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    University of Wisconsin-Madison
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    Learners make kimchee or sauerkraut, which is really just fermented cabbage, in a 2-liter plastic bottle. The fermentation process takes from 3 days to 2 weeks to complete, and learners measure the...

    $1 - $5 per group Ages 4 - 14 1 to 4 weeks
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    COSI
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    In this physics activity, learners will investigate the strength of egg shells. They will attempt to stack books on top of inverted half egg shells to see how many they can hold, and the results...

    1 cent - $1 per group Ages 6 - 11 10 to 30 minutes
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    American Chemical Society
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    In this activity on page 2 of the PDF, learners discover how color changes can help scientists distinguish between acids and bases. Learners create colorful rainbow trout artwork using universal...

    $10 - $20 per student Ages 6 - 11 10 to 30 minutes
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    CIENTEC Foundation
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    In this Spanish-language chemistry activity, learners use simple materials to explore how fire extinguishers work to put out fires. Safety note: this activity involves the use of a small candle...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    Learners make their own acid-base indicator from red cabbage. They use this indicator to test substances around the house. Red cabbage juice is purple in water (neutral), pink or red in vinegar ...

    $1 - $5 per student Ages 6 - 14 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    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. Learners can use...

    $1 - $5 per student Ages 11 - 14 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    In this activity, learners explore acids and bases by preparing six solutions that combine vinegar and ammonia, ranging from acid (all vinegar) to base (all ammonia). They add an indicator to each...

    $5 - $10 per group Ages 8 - adult Under 5 minutes
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    The Exploratorium
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    Ocean acidification is a big issue due to the amount of carbon dioxide humans release. CO2 in the atmosphere is absorbed into the ocean thus changing its acidity. The more acidic the ocean becomes,...

    $1 - $5 per student Ages 11 - 18 10 to 30 minutes

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