difference between methanol and ethyl acetate
Molecular Structures of Methanol and Ethyl Acetate
Methanol (CAS: 67-56-1) and ethyl acetate (CAS: 141-78-6) have different molecular structures.
Methanol has the chemical formula CH₃OH and is a single compound. Its molecule contains one hydroxyl group (OH) and one methyl group (CH₃).
EA (CAS 141-78-6) has the chemical formula CH₃COOCH₂CH₃ and is an ester compound. Its molecule contains two ethyl groups (CH₃CH₂) and one acetyl group (CH₃COO).
Physical Properties of Methanol and Ethyl Acetate
- Melting Point and Boiling Point: Methanol melts at -97.6°C and boils at 64.7°C; ethyl acetate melts at -83°C and boils at 77°C. Ethyl acetate has a higher melting point and boiling point than methanol.
- Density: Methanol has a density of 0.79 g/cm³, making it lighter than water; ethyl acetate has a density of 0.9 g/cm³, making it heavier than water.
Chemical Properties of Methanol and Ethyl Acetate
- Acidity/Alkalinity: Methanol is a weak acid that reacts with strong bases to form salts and water; ethyl acetate is non-acidic and non-basic, and does not react with bases.
- Stability: Methanol undergoes oxidation reactions in air and sunlight, making it prone to decomposition; ethyl acetate is relatively stable.
- Solubility: Methanol is miscible with water and other organic solvents; ethyl acetate is poorly miscible with water and only miscible with certain organic solvents.
| Item | Methanol | Ethyl Acetate |
|---|---|---|
| CAS Number | 67-56-1 | 141-78-6 |
| Chemical Formula | CH₃OH | C₄H₈O₂ |
| Chemical Class | Alcohol | Ester |
| Molecular Weight | 32.04 | 88.11 |
| Appearance | Colorless liquid | Colorless liquid |
| Odor | Alcohol-like, pungent | Mild, fruity ester odor |
| Boiling Point | 64.7 °C | ~77 °C |
| Flash Point | 11 °C | −4 °C |
| Density (20°C) | ~0.79 g/cm³ | ~0.90 g/cm³ |
| Water Solubility | Completely miscible | Partially miscible |
| Polarity | High | Medium |
| Toxicity | High (toxic) | Relatively low |
Applications of Methanol and Ethyl Acetate
- Methanol (CAS: 67-56-1) serves as a vital organic solvent and key chemical feedstock, widely used in alcohol production, pigments, plastics, and women's cosmetics.
- Ethyl acetate (EA CAS 141-78-6) finds extensive applications in chemical experiments, paints, coatings, cosmetics, and flavorings.
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