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You will need:
• 1/4 cup (60 milliliters) grape juice
• Small, clear glass
• 1 tablespoon (15 milliliters) of baking soda
• 1 tablespoon (15 milliliters) of white vinegar
Here is how:
First get
permission to use kitchen equipment and ingredients.
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Pour the
grape juice into the glass.
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Slowly mix
the baking soda into the grape juice. The color at the top of the juice will
change to blue.
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Now add
the vinegar to the mixture, a drop at a time. The color will change to pink
where the vinegar drips.
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When you
pour out the liquid in the sink, notice how dark it has become.
Why?
Grape juice looks purple because its molecules are arranged in such a way that
it absorbs all the colors of light except purple. The purple reflects back to
your eyes. This is how you see color. Adding other substances changes the
molecular structure of grape juice, so its color changes.
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