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Question
Why is pure acetic acid also known as glacial acetic acid?
Solution
Acetic acid that contains a very low amount of water (less than 1%) is called anhydrous (water-free) acetic acid or glacial acetic acid. The reason it's called glacial is because it solidifies into solid acetic acid crystals just cooler than room temperature at 16.7°C, which ice. Removing the water from acetic acid lowers its melting point by 0.2°C.
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