Ethanoic acid, glacial and liquid. Both bottles contain ethanoic acid (CH3.COOH, also known as acetic acid), but glacial acetic acid is the water free (anhydrous) form. Pure, water-free ethanoic acid freezes to a colourless at 16.7 degrees Celsius, just below normal room temperature. Ethanoic acid is the chemical that gives vinegar its sour taste and strong smell.

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