[mcdull1016]

what is the difference between glacial acetic acid and normal acetic acid?

is it one is more powerful than the other?

[sub]

At low temperature acetic acid freezes and it is called Glacia acetic acid

[DrCMS]

Glacial acetic acid or glacial acrylic acid mean they contain no water and they freeze at 16.6 and 13°C respectively.  

Acetic and acrylic acids are sold industrial mainly at two strengths:

Glacial >99% acid
80% acid (20% water added to reduce the freezing point)

[Ian Donaldson]

Can anyone  suggest a way of making glacial acetic acid at home from household vinegar ?   Textbooks suggest using dehydrating agents such as phosphorus pentoxide - not easily available to the amateur chemist, or else going via a salt such as sodium or calcium acetate, and distilling the dry salt with conc sulfuric acid.   Would it be obtainable by fractional distillation ? or by selective freezing ?