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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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    Oregon Museum of Science and Industry
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    Using household materials, learners can make white gooey globs from clear solutions. Alum, dissolved in water, reacts with the hydroxide in ammonia to create aluminum hydroxide. This creates a soft...

    1 cent - $1 per student Ages 8 - 14 5 to 10 minutes
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    Oregon Museum of Science and Industry
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    Learners combine different plant solutions -- made from fruits, vegetables, and flowers -- with equal amounts of vinegar (acid), water (neutral), and ammonia (base). They compare the color changes...

    1 cent - $1 per group Ages 11 - adult Under 5 minutes
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    Oregon Museum of Science and Industry
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    In this simple activity (on page 2 of the PDF), learners make a crystal garden using salt, water, and a brick. This is a take-home version of the display Crystal Garden in the Nature of Matter unit...

    $1 - $5 per student Ages 6 - 14 1 to 7 days
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    Oregon Museum of Science and Industry
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    This lesson gives full instructions for making cabbage juice indicator, a procedure sheet for learners to record observations as they use the indicator to test materials, and extension activities...

    $1 - $5 per group Ages 6 - 14 30 to 45 minutes