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BTB changes color because of the CO2 in chemicals. When we blow into the BTB with a straw, the water vapor fuses with the BTB and change color. Our breath has some acidic characteristics. The BTB changes from blue, its original color to green-yellow, that's proof that what we breath has acidic molecules.

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12y ago
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14y ago

Blue

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12y ago

ANAL!

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Q: What color would you expect BTB to be when pure water is added?
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