 | Vocabulary |
carboxylic acid acetic acid crystallization
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Anhydrous (water-free) acetic acid is sometimes called glacial acetic acid because it solidifies just below room temperature, at 16.7°C. Acetic acid can be concentrated by dripping the impure compound over a "stalactite" of glacial (frozen) acetic acid. Pure acetic acid crystallizes, while impurities run off in the liquid.