Question

Why is pure ethanoic acid called glacial ethanoic acid (or glacial acetic acid) ?

Answer 1

pure acetic acid forms a ice like solid on cooling . anhydrous acetic acid on cooling bellow 16.5 degree C crystallizes out in the pure form forming a crystalline mass resembling ice[m.p around 17degrees C]. hence pure acetic acid is called glacial acetic acid.

Answer 2

This is because pur ethanoic acid is somwhat like ice forms and is foggy ao it looks like glacier( small one as perception)
Therefore it is called Glacial acetic acid