Glacial Acetic Acid

Glacial Acetic Acid: Student Notes

Definition: Glacial acetic acid is the anhydrous (water-free) form of acetic acid (CH₃COOH).

The "Aqueous" Trap: Many students confuse "Glacial" with "Aqueous."

• Glacial: 99%+ Pure (No water).
• Aqueous: Dissolved in water (like vinegar).

Physical & Chemical Properties

• Appearance: Clear, colorless liquid or "icy" solid.
• Odor: Extremely strong, pungent, vinegar-like smell.
• Corrosivity: It is a weak acid (chemically speaking) but highly corrosive to skin and eyes because it is so concentrated.
• Solubility: It is miscible (mixes perfectly) with water.
• Freezing Point: 16.6°C. It turns into "ice" at room temperature if the room is cool!
• Density: 1.05 g/cm³ (Slightly denser than water).
• Weak Acid: It only partially dissociates in water, yet it is highly corrosive in concentrated form.

Safety First: Glacial Acetic Acid is a dehydrating agent. It can cause severe burns and permanent eye damage. Always use a fume hood.

Quick Test

1. Why is it called "Glacial"? It is found in glaciers.
It freezes into ice-like crystals at 16.6°C.
It is an aqueous solution.

2. What is the approximate concentration? 5%
50%
99-100%

3. What happens when it is mixed with water? It is immiscible (forms layers).
It is miscible (dissolves completely).
It explodes instantly.

4. Chemically, Glacial Acetic Acid is a: Strong Acid
Strong Base
Weak Acid

5. Which is the correct molecular formula? CH₃COOH
HCl
C₆H₁₂O₆