Why is pure acetic acid often called glacial acetic acid?
(A) Because it freezes just below 0°C, forming white crystals.
(B) Because it freezes just below 100°C, forming white crystals.
(C) Because it freezes just below room temperature, forming white crystals.
(D) Because it freezes just above room temperature, forming white crystals.

Question

12-09-2019
Chemistry

contestada

Why is pure acetic acid often called glacial acetic acid?
(A) Because it freezes just below 0°C, forming white crystals.
(B) Because it freezes just below 100°C, forming white crystals.
(C) Because it freezes just below room temperature, forming white crystals.
(D) Because it freezes just above room temperature, forming white crystals.

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Answer:

The correct option is: (C) Because it freezes just below room temperature, forming white crystals

Explanation:

Acetic acid or ethanoic acid, is colorless liquid with a characteristic pungent smell and sour taste.

In the pure form, acetic acid is known as glacial acetic acid. This is because it forms white crystals at 16.6 °C, i.e. just below the room temperature.

Since, glacial acetic acid is free of water molecules, it is also known as anhydrous acetic acid.