Lena Savoie
The boiling point of alcohol depends on its type. For example, ethanol has a boiling point of 78°C, while ethyl alcohol's boiling point is 78.3°C. The boiling point of water, in comparison, is 100°C. This difference in boiling points is significant and can be attributed to the stronger intermolecular forces present in ethanol molecules compared to water molecules. The solubility of alcohol in water is due to the hydroxyl group in water molecules, which forms hydrogen bonds with alcohol. This property of hydroxyl groups earns them the name hydrophilic or water-loving. Distillation can be used to separate different types of alcohol and other organic compounds based on their varying boiling points.
| Characteristics | Values |
|---|---|
| Name | Ethanol, also known as grain alcohol |
| Chemical formula | C2H5OH |
| Molecular weight | 46 |
| Boiling point | 78.37 °C (173.1 °F or 173 °F) |
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What You'll Learn
Ethanol has a boiling point of 78°C
Ethanol, also known as grain alcohol (C2H5OH), has a boiling point of 78°C (173°F) at atmospheric pressure. This is notably higher than the boiling points of other compounds with similar molecular weights, such as propane, which has a boiling point of −42°C (−44°F) despite having a molecular weight of only 2 units less than ethanol. The higher boiling point of ethanol is due to the strong intermolecular forces between ethanol molecules, which are hydrogen bonds formed between the oxygen and hydrogen atoms of neighbouring molecules.
The relatively high boiling point of ethanol has practical implications. For example, it can be used to separate ethanol from other liquids and organic compounds with lower boiling points through distillation. During distillation, a liquid is heated so that more volatile compounds boil away, and the condensate is collected, either as a method of purifying the original liquid or to isolate the volatile compound.
The boiling point of ethanol also has implications for cooking. Many people believe that adding alcohol to a dish during cooking will boil off the alcohol, leaving only the flavour behind. However, scientists at the University of Idaho Department of Agriculture have found that most cooking methods do not remove alcohol as effectively as one might think. For example, when alcohol is added to a boiling liquid and then removed from the heat, about 85% of the alcohol remains. Even flaming the liquid to burn off alcohol still allows for 75% retention. This is because alcohol has a higher vapour pressure than water, so it evaporates more slowly.
Ethanol's boiling point of 78°C is also relevant in the context of other alcohols. For example, methanol (methyl alcohol, wood alcohol) has a lower boiling point of 66°C or 151°F, while isopropyl alcohol (isopropanol) has a slightly higher boiling point of 80.3°C or 177°F. These differences in boiling points can be used to separate these alcohols from one another and from other compounds through distillation.
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Ethyl alcohol boils at 78.3°C
The boiling point of ethyl alcohol, also known as ethanol, is approximately 78°C, or 78.3°C to be more precise. This is equivalent to 173°F or 351 Kelvin.
The boiling point of a substance is the temperature at which it changes state from a liquid to a gas. Ethyl alcohol has a lower boiling point than water, which boils at 100°C. This difference in boiling points is due to the ability of ethanol molecules to form intermolecular hydrogen bonds with each other, resulting in a stronger attraction between them compared to water molecules.
The variation in boiling points between ethanol and other substances can be utilised in the distillation process. Distillation involves heating a liquid to separate more volatile compounds, which boil away, from less volatile ones. As ethanol has a lower boiling point than water, it can be separated from water through distillation. However, the two substances cannot be completely separated through this method.
The boiling point of a substance can also impact cooking methods. For example, it is a common misconception that adding alcohol to a dish while cooking will cause the alcohol to boil off completely, leaving only the flavour behind. However, studies have shown that most cooking methods do not significantly reduce the alcohol content in food. In fact, the highest retention of alcohol occurs when it is added to a boiling liquid and then removed from the heat, resulting in about 85% of the alcohol remaining.
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Alcohol boils at 80°C, lower than water's 100°C
The type of alcohol that boils at 78°C is ethanol, also known as grain alcohol. Ethanol is the type of alcohol found in alcoholic drinks.
Ethanol has a lower boiling point than water due to its polarity and hydrogen bonding with water. Ethanol and water are both polar molecules, meaning they have opposite charges on their ends, which makes them stick together. This mechanism is called hydrogen bonding, a powerful force.
The boiling point of ethanol can be altered by adding salt or sugar to a water mixture. Salt increases the boiling point, while sugar lowers it. This is because salt and sugar change the number of water molecules in the solution, affecting how easily they can escape as vapour. For example, the boiling point of ethanol and water can be separated by distillation, a process where a liquid is carefully heated so that more volatile compounds boil away.
However, distillation cannot fully separate ethanol and water because they form an azeotrope, binding them together. The only way to completely remove ethanol from water is to boil it away or let it evaporate.
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Alcohol has a higher vapour pressure than water
The boiling point of ethanol, also known as grain alcohol (C2H5OH), is 78 °C (173 °F). Ethanol has a higher vapour pressure compared to water. Vapour pressure refers to the pressure exerted by a gas above its liquid phase. It is dependent on the temperature and the strength of the attractive forces between the molecules of the liquid. When a liquid is heated, its vapour pressure increases as more molecules gain enough energy to escape from the liquid and become gas molecules.
At a given temperature, the vapour pressure of a substance is influenced by the strength of the intermolecular forces within the liquid. Substances with stronger intermolecular forces, such as hydrogen bonding, have lower vapour pressures because these forces hold the molecules together more tightly, making it harder for them to escape as gas molecules.
Water molecules exhibit extensive hydrogen bonding, which results in strong intermolecular attractions. This leads to a lower vapour pressure compared to substances with weaker intermolecular forces. While ethanol also has the ability to form hydrogen bonds, it has a higher vapour pressure than water because it has a larger molecular weight and experiences stronger dispersion forces.
The higher vapour pressure of ethanol compared to water has practical implications, especially in cooking. When alcohol is added to a boiling liquid and then removed from the heat, about 85% of the alcohol remains. This is because ethanol's higher vapour pressure causes it to evaporate more readily than water. Similarly, flaming the liquid to burn off the alcohol still results in a significant retention of about 75%.
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Distillation can separate alcohol from water
Distillation is a process of physical separation that can be used to separate a mixture of two or more liquids with different boiling points. It operates over a wide range of pressures and can separate a variety of chemicals with high purity.
The process of distillation involves heating a mixture of liquids to a certain temperature, at which one liquid will evaporate before the other. The vapour then passes into a condenser, where it is cooled and condensed back into a liquid, which can then be collected. This process can be repeated to increase the purity of the separated liquids, as the boiling point can be used as a measure of purity.
The separation of alcohol from water through distillation is based on the fact that they have different boiling points. Water has a boiling point of 100°C, while ethanol, a type of alcohol, has a boiling point of 78°C. Therefore, when a mixture of water and ethanol is heated, the ethanol evaporates first and can be collected through condensation and cooling.
The distillation of alcohol from water has been practised for centuries, with the publication of "The Art of Distillation" by John French in 1651 providing a comprehensive guide to the process. The process typically involves the use of vessels called retorts or alembics, which are forms of glassware with long necks that act as condensers. Later, copper alembics were invented, and various mixtures were used to keep the joints tight, such as dough made from rye flour. These alembics also featured a cooling system to improve the condensation of alcohol.
While distillation is an effective method for separating alcohol from water, it has limitations and environmental concerns. Complete purification of a mixture is not possible through distillation alone, and further chemical separation methods may be required. Additionally, distillation consumes a significant amount of energy, contributing to its large environmental footprint.
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Frequently asked questions
The alcohol with a boiling point of 78°C is ethanol, also known as ethyl alcohol.
The boiling point of ethanol is 78.3°C or 78.37°C, which is 351 Kelvin and 173°F or 173.1°F.
No, scientists at the University of Idaho Department of Agriculture found that most cooking methods do not affect alcohol content as much as expected. The highest retention of alcohol occurs when alcohol is added to a boiling liquid and then removed from the heat, which retains about 85% of the alcohol.
