Glacial acetic acid (CH3COOH) is a colorless liquid with a strong pungent odor and a density of approximately 1.049 g/cm³ at 20°C, making it slightly heavier than water and important for industrial formulation, storage, and transportation calculations. In its pure form, glacial acetic acid solidifies below 16.6°C (61.88°F), forming ice-like crystals that give it the name "glacial" acetic acid.
Factors Influencing Density
The density of a substance can be influenced by several factors, including temperature, purity, and atmospheric pressure. For glacial acetic acid, as the temperature increases, the density decreases slightly, becoming less dense as it transitions from the solid state to the liquid state. Consequently, it is essential to measure density under controlled conditions to ensure accuracy, particularly in scientific and industrial applications.
Acetic Acid Density at Different Temperatures
Acetic acid density decreases as temperature rises. At 20°C, the density is about 1.049 g/cm³, while at 40°C it drops to approximately 1.030 g/cm³.
| Temperature | Density |
|---|---|
| 20°C | 1.049 g/cm³ |
| 25°C | 1.044 g/cm³ |
| 40°C | 1.030 g/cm³ |
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Physical Properties of Glacial Acetic Acid
Glacial acetic acid contains typically 99.5% or higher purity and freezes at 16.6°C, forming ice-like crystals.
| Property | Value |
|---|---|
| Chemical Formula | CH3COOH |
| CAS Number | 64-19-7 |
| Boiling Point | 117.9°C |
| Melting Point | 16.6°C |
| Flash Point | Approximately 39°C |
Importance of Glacial Acetic Acid Density in Applications
The density of glacial acetic acid plays an important role in chemical processing, storage, and formulation accuracy. In laboratories, density data helps technicians calculate solution concentrations, dilution ratios, and material quantities more precisely during testing and analytical procedures.
In industrial production, density directly affects dosing systems, tank calibration, and transportation weight calculations. Glacial acetic acid is widely used in the production of acetate esters, acetic anhydride, textiles, coatings, and pharmaceutical intermediates, where stable density values are important for maintaining product consistency and quality standards.
Common Chemical Applications of Acetic Acid
Acetic acid is widely used in:
- Vinyl acetate monomer production
- Textile dyeing chemicals
- Pharmaceutical intermediates
- Food additives
- Industrial solvents
More than 65% of global acetic acid consumption is linked to VAM and purified terephthalic acid (PTA) production for plastics and polyester manufacturing.
FAQ About Acetic Acid
What is the chemical formula of acetic acid?
The chemical formula of acetic acid is CH3COOH.
Why is acetic acid called glacial acetic acid?
Pure acetic acid freezes at 16.6°C and forms ice-like crystals, so it is called "glacial" acetic acid.
Is acetic acid a strong or weak acid?
Acetic acid is a weak organic acid commonly used in food and industrial applications.
What are the main sources of acetic acid?
Most industrial acetic acid is produced from methanol carbonylation. It is also naturally found in vinegar.
Is acetic acid safe for consumption?
Diluted acetic acid in vinegar is safe for food use, but concentrated glacial acetic acid is corrosive and must be handled carefully.
