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Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

$1 - $5 per group Ages 8 - 18 10 to 30 minutes
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In this online interactive simulation, learners will test the pH of liquids like coffee, spit, and soap to determine whether each is acidic, basic, or neutral.

free Ages 11 - adult 10 to 30 minutes