Alexei Volkov
Isopropyl alcohol, also known as isopropanol or rubbing alcohol, is a colourless, flammable organic compound with a strong odour. It is commonly used in medical settings as a hand sanitizer and in industrial and household applications as a solvent. With a freezing point of −89.5 °C (−129.1 °F), it is often used to melt ice. Isopropyl alcohol is also known to leave a residue haze when used on certain plastic surfaces, although it evaporates completely from plastic surfaces, especially in warm environments with good airflow.
| Characteristics | Values |
|---|---|
| Freezing point | −89.5 °C (−129.1 °F) |
| Boiling point | 80.37 °C |
| Miscibility | Water, ethanol, chloroform |
| Insolubility | Salt solutions |
| Viscosity | Increases with decreasing temperature |
| Absorbance | 205 nm in an ultraviolet-visible spectrum |
| Oxidation product | Acetone |
| Toxic effects | Central nervous system depression, coma |
| Flammability | Yes |
| Color | Colorless |
| Odor | Pungent alcoholic |
| Taste | Slightly bitter |
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What You'll Learn
Isopropyl alcohol freezes at −89.5 °C (−129.1 °F)
Isopropyl alcohol, also known as "rubbing alcohol", has a freezing point of −89.5 °C or −129 °F. This is an extremely low freezing point when compared to water, which freezes at 0 °C or 32 °F.
The freezing point of isopropyl alcohol can be compared to other common chemicals that are liquid at room temperature. For example, methanol, ethanol, propanol, acetone, toluene, formaldehyde, and methyl ethyl ketone (a paint stripper) all freeze within a range of −100 to −200 °F.
The low freezing point of isopropyl alcohol can be useful in certain applications, such as de-icing windshields. When a mixture of water and isopropyl alcohol is applied to a frozen windshield, it can cause the ice to melt. This is because the mixture blends the freezing points of water and alcohol, resulting in a temperature that is lower than the outside temperature, thereby melting the ice.
However, due to its extremely low freezing point, isopropyl alcohol can also quickly evaporate, especially when compared to water. This was demonstrated in an anecdote where a person sprayed rubbing alcohol on their windshield, only to have it evaporate and leave behind water, which then refroze.
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Isopropyl alcohol evaporates from plastic surfaces
Isopropyl alcohol, also known as isopropanol or rubbing alcohol, is a colourless, flammable organic compound with a pungent alcoholic odour. It is commonly used in medical settings as a rubbing alcohol and hand sanitiser, as well as in industrial and household applications as a solvent. Due to its ability to dissolve a wide range of substances, isopropyl alcohol is also a key ingredient in products such as antiseptics, disinfectants, detergents, and fuel additives.
Isopropyl alcohol has a very low freezing point of approximately −89.5°C (−129°F). This is significantly lower than the freezing point of water, which is 0°C (32°F). Because of this low freezing point, isopropyl alcohol can be used to de-ice windshields or door locks, as it will melt ice and prevent it from refreezing.
Despite its utility, isopropyl alcohol poses certain safety risks due to its flammability. Additionally, its ingestion or absorption can lead to toxic effects, including central nervous system depression and coma.
When it comes to plastic surfaces, isopropyl alcohol can be used as a solvent to dissolve and remove certain substances. For example, it can be used to remove brake fluid traces from hydraulic braking systems, preventing contamination of the brake pads. However, it is important to note that isopropyl alcohol is not effective on all types of plastic. For instance, it is not miscible with salt solutions and can be separated by a process known as "salting out".
In terms of evaporation, isopropyl alcohol has a boiling point of 80.37°C when mixed with water, forming what is known as an azeotrope. This means that isopropyl alcohol will evaporate from plastic surfaces, especially at higher temperatures. The evaporation rate will depend on various factors, including the temperature, humidity, and airflow in the environment.
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Isopropyl alcohol is used as a solvent and hand sanitiser
Isopropyl alcohol, also known as isopropanol, is a versatile chemical with a range of applications, including as a solvent and a hand sanitiser. With a freezing point of around -129 degrees Fahrenheit, it is known for its extremely low freezing temperature.
Solvent Applications
Isopropyl alcohol is an effective solvent, capable of dissolving several non-polar compounds. Its ability to evaporate quickly and leave almost no traces makes it a popular choice for cleaning various surfaces and equipment. It can be used to clean electronics, windows, glass, appliances, and even floppy drives and optical disc drives. Its solvent properties also make it useful for removing glue stains and polishing old vinyl records.
Hand Sanitiser
Isopropyl alcohol is a key ingredient in hand sanitisers, where it acts as a disinfectant, killing bacteria, germs, and viruses. To make an effective hand sanitiser, isopropyl alcohol is typically mixed with distilled water or aloe vera gel to create a solution that is at least 60% isopropyl alcohol. This concentration is crucial, as a pure solution would not be as effective in killing bacteria due to the need for a small amount of water to penetrate the pore membranes of bacteria.
Other Uses
In addition to its solvent and sanitising properties, isopropyl alcohol finds applications in various other areas. It is used in industrial processes, cosmetics, personal hygiene products, pharmaceuticals, and medical applications due to its low toxicity compared to alternative products.
Overall, isopropyl alcohol's unique properties, particularly its low freezing point and solvent capabilities, make it a valuable chemical in a wide range of contexts, contributing to its popularity in both industrial and household settings.
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Isopropyl alcohol is toxic and flammable
Isopropyl alcohol, also known as isopropanol or 2-propanol, is a colorless, flammable organic compound with a pungent alcoholic odor. It is widely used as a solvent and cleaning fluid due to its ability to dissolve various substances, including oils and oil-based residues.
While isopropyl alcohol is considered relatively non-toxic, particularly when compared to other preservatives and alcohols, it can still pose significant health risks if ingested, inhaled, or absorbed through the skin. Ingesting isopropyl alcohol can lead to rapid intoxication and can cause severe central nervous system depression, hypothermia, respiratory depression, and even coma. Inhalation of large amounts of isopropyl alcohol can result in headaches, nausea, vomiting, throat irritation, and difficulty breathing.
Due to its flammability, isopropyl alcohol should be handled and stored with caution. Its vapors may form explosive mixtures with air and can easily ignite. It should be kept away from heat, flames, and other sources of ignition. In the event of exposure to isopropyl alcohol, it is crucial to move to fresh air immediately and seek medical attention if symptoms persist or worsen.
Isopropyl alcohol is also used in DNA extraction and as an additive in alkaline anisotropic etching of monocrystalline silicon. Its low freezing point of -89.5°C makes it useful in certain applications, such as preventing ice buildup on windshields. However, its toxicity and flammability characteristics highlight the importance of safe handling and storage practices to mitigate potential hazards.
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Isopropyl alcohol dissolves plastics like polyethylene and polypropylene
Isopropyl alcohol (C₃H₈O) can damage plastics, but its effects vary depending on the type of plastic and the concentration and temperature of the alcohol. High concentrations of isopropyl alcohol, such as 90.0%-91.0%, are more likely to cause corrosion and damage to plastics. However, it is important to note that not all plastics are affected equally, and some may show little to no damage after prolonged exposure. For example, high-density polyethylene (HDPE) and low-density polyethylene (LDPE) exhibit minimal to no damage when exposed to isopropyl alcohol at concentrations of 90.0%-91.0% and temperatures of 20°C-50°C for approximately one month.
Polyethylene (PE) and polypropylene (PP) generally have good compatibility with isopropyl alcohol, but they may develop a residue haze, especially on shiny surfaces. Diluting isopropyl alcohol with water can help reduce this effect. PVC (polyvinyl chloride) can handle lower concentrations of isopropyl alcohol but may also exhibit haze on glossy surfaces. On the other hand, PVDF (polyvinylidene fluoride) and PTFE (polytetrafluoroethylene) show excellent resistance to isopropyl alcohol.
It is crucial to consider the chemical resistance ratings of plastics when determining their compatibility with isopropyl alcohol. These ratings provide an indication of the potential effects, ranging from "A" (no effect) to "D" (severe effect) and "U" (unsatisfactory). Testing under actual operating conditions is essential, as factors such as temperature and chemical concentration can influence the resistance of plastics to isopropyl alcohol.
To ensure safe handling and usage, isopropyl alcohol should always be used in a well-ventilated area to minimize the inhalation of harmful fumes. It should be stored in tightly closed containers, away from heat and open flames, in a cool, dry place. While isopropyl alcohol is effective in eliminating germs, its interaction with plastics can vary, and it is important to refer to chemical compatibility charts and conduct proper testing to determine the suitability of specific plastics for exposure to isopropyl alcohol.
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Frequently asked questions
Yes, isopropyl alcohol freezes at −89.5 °C (−129.1 °F).
Yes, isopropyl alcohol evaporates from plastic surfaces, especially in warm environments with good airflow. However, it may leave a residue haze, especially on shiny surfaces.
Isopropyl alcohol can damage some plastics but not all. It is generally well-tolerated by polyethylene and polypropylene, but it may leave a residue haze on these surfaces. PVC (Polyvinyl Chloride) is suitable for lower concentrations of isopropyl alcohol but may also develop a haze on glossy surfaces. PVDF (Polyvinylidene Fluoride) and PTFE (Polytetrafluoroethylene) have high resistance to isopropyl alcohol.
Isopropyl alcohol is commonly used as a solvent and as a rubbing alcohol and hand sanitizer. It is also used in industrial and household applications, such as in detergents, antiseptics, and disinfectants.
