Vivian Marlowe
Isopropyl alcohol, also known as isopropanol, is a colourless, flammable organic compound with a pungent alcoholic odour. It is a common ingredient in products such as antiseptics, disinfectants, and detergents. The IUPAC name for isopropyl alcohol is propan-2-ol, which is also known as 2-propanol. Propanol has two isomers: propan-1-ol and propan-2-ol, which differ in the position of their respective hydroxyl (-OH) groups. Propan-1-ol is a primary alcohol, while propan-2-ol is a secondary alcohol. This small difference in chemical structure leads to noticeable differences in the behaviour, use, and categorisation of the two compounds.
| Characteristics | Values |
|---|---|
| IUPAC Name | Propan-2-ol |
| Other Names | Isopropanol, Isopropyl Alcohol, Isopropyl, 2-Propanol, IPA, Propanol, Sec-Propanol, S-Propanol, iPrOH, i-PrOH, IpOH, Dimethyl Carbinol, Rubbing Alcohol |
| Chemical Formula | \((CH3)2CHOH\) |
| State | Colourless Liquid |
| Odor | Pungent Alcoholic Odor |
| Taste | Bitter |
| Miscibility | Miscible in Water, Ethanol, and Chloroform |
| Non-Miscibility | Not Miscible with Salt Solutions |
| Boiling Point | 80.37 °C |
| Viscosity | Becomes Viscous at Lower Temperatures |
| Freezing Point | −89.5 °C |
| Flammability | Flammable |
| Toxicity | More Toxic than Ethanol, Less Toxic than Ethylene Glycol or Methanol |
| Poisoning Symptoms | Flushing, Headache, Dizziness, CNS Depression, Nausea, Vomiting, Anesthesia, Hypothermia, Low Blood Pressure, Shock, Respiratory Depression, Coma |
| CNS Depressant | Yes |
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What You'll Learn
Isopropyl alcohol is also known as isopropanol
Isopropyl alcohol, also known as isopropanol, is a colourless, flammable liquid with the chemical formula (CH3)2CHOH. It is a simple secondary alcohol, where the alcohol carbon atom attaches to two other carbon atoms. It is a structural isomer of propan-1-ol and ethyl methyl ether.
Isopropyl alcohol is widely used as a solvent and as a cleaning fluid, especially for dissolving oils and oil-based residues. It is also used in antifreeze products, quick-drying inks and oils, body rubs, hand lotions, cosmetics, and pharmaceuticals. In medicine, it is used as an antiseptic for skin and instrumentation. It is a major ingredient in "gas dryer" fuel additives and is often sold in aerosol cans as a windshield or door lock de-icer.
Isopropyl alcohol is commercially available as rubbing alcohol and gels in concentrations of 60-70%. It is also used in hand sanitisers and disinfecting pads. It is important to note that isopropyl alcohol poses safety risks due to its flammability and potential for peroxide formation. It can also cause ocular surface irritation, epithelial keratitis, and corneal abrasion.
The various chemistry naming standards and conventions mean that this widely used substance has several names. The IUPAC functional class name is isopropyl alcohol, and the substitutive name is isopropanol. The standard IUPAC name is propan-2-ol, which indicates the type of hydrocarbon chain attached to the hydroxyl group and the point of attachment.
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IUPAC nomenclature gives the name propan-2-ol
Isopropyl alcohol, also known as isopropanol, has the IUPAC name propan-2-ol. This is because the IUPAC system of nomenclature provides functional class names and substitutive names. The functional class name is isopropyl alcohol, and the substitutive name is isopropanol. These are both ''general' names, as the 'iso' prefix is from the common naming system.
The IUPAC name, propan-2-ol, indicates both the type of hydrocarbon chain attached to the hydroxyl group and the point of attachment. The '2' in the name indicates that the hydroxyl group is attached to the second carbon atom in the chain. This is important because it helps to distinguish isopropyl alcohol from other alcohols with similar structures, such as propan-1-ol, which is a structural isomer of isopropyl alcohol.
The standardised nomenclature provided by IUPAC is descriptive and provides information about the substance's structure and composition. This is important for identifying different substances, especially when dealing with complex organic compounds. The IUPAC name also helps to avoid confusion caused by the various naming standards and conventions used in chemistry. For example, isopropanol is also known as isopropyl alcohol, which can be misleading for those unfamiliar with the compound.
The use of standardised nomenclature is crucial in chemistry to ensure accurate communication and understanding of chemical compounds. While propan-2-ol may not be as widely used as isopropanol or isopropyl alcohol, it is the preferred IUPAC name and provides valuable information about the compound's structure.
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Isopropyl alcohol is a secondary alcohol
Isopropyl alcohol, also known as isopropanol or 2-propanol, is a secondary alcohol with the chemical formula (CH3)2CHOH. It is a colourless, flammable, organic compound with a pungent alcoholic odour. It is often used as a solvent and has a wide range of applications, including as a rubbing alcohol, hand sanitiser, and in industrial and household products such as antiseptics, disinfectants, and detergents.
Isopropyl alcohol is commercially available as rubbing alcohol and gels with a concentration of around 70%. It serves as a common ingredient in antiseptics, disinfectants, and detergents. It is produced through the hydration of propene or hydrogenation of acetone, and modern processes can achieve anhydrous alcohol through azeotropic distillation.
Isopropyl alcohol is an organic polar molecule that is miscible in water, ethanol, and chloroform. This demonstrates its ability to dissolve a wide range of substances, including ethyl cellulose, polyvinyl butyral, oils, alkaloids, and natural resins. However, it is not miscible with salt solutions and can be separated by adding sodium chloride in a process known as "salting out".
The compound forms an azeotrope with water, resulting in a boiling point of 80.37 °C and a composition of 87.7% by mass (91% by volume) of isopropyl alcohol. It has a slightly bitter taste and becomes viscous at lower temperatures, freezing at −89.5 °C. It poses safety risks due to its flammability and potential for peroxide formation, which can occur through distillation over magnesium or reaction with air and oxygen.
Isopropyl alcohol is the simplest example of a secondary alcohol, where the alcohol carbon atom is attached to two other carbon atoms. It is a structural isomer of propan-1-ol and ethyl methyl ether, and it was first synthesized in 1853 by Alexander William Williamson.
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Propan-2-ol is a structural isomer of propan-1-ol
Propanol is an alcohol that has two different isomers: propan-1-ol and propan-2-ol. Propanol has a molecular structure made up of a 3-carbon backbone with eight hydrogen atoms, including a hydroxyl group, attached to it. The two isomers of propanol can be identified by the position of the hydroxyl group on the carbon backbone.
Propan-1-ol has its –OH group attached to the terminal carbon atom of the molecule. It appears as a colourless liquid at room temperature and has a fruity flavour and a mildly alcoholic smell. It is a primary alcohol, and when it undergoes oxidation, it forms aldehydes. It is the most acidic type of alcohol.
Propan-2-ol, on the other hand, has its –OH group attached to the middle carbon atom of the molecule. It is a secondary alcohol that is generally more reactive, more stable, and less acidic than propan-1-ol. When propan-2-ol undergoes oxidation, it forms ketones instead of aldehydes.
Propan-2-ol is also known as isopropyl alcohol (IPA) or isopropanol. It is a colourless, flammable organic compound with a pungent alcoholic odour. It is widely used across different industries, including in medical settings as a rubbing alcohol and hand sanitiser, and in industrial and household applications as a solvent.
The various naming conventions in chemistry can lead to confusion, as a single compound can often have multiple names. For example, isopropanol and isopropyl alcohol are two different names for the same chemical compound. The IUPAC nomenclature provides functional class names and substitutive names. The IUPAC functional class name is isopropyl alcohol, while the substitutive name is isopropanol. The standard IUPAC name for isopropyl alcohol is propan-2-ol, which indicates the type of hydrocarbon chain attached to the hydroxyl group and the point of attachment.
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![McKesson Isopropyl Rubbing Alcohol 70% [1 Count] USP First Aid Antiseptic, 32 oz](https://m.media-amazon.com/images/I/61lYiXl9g9L._AC_UL320_.jpg)
Isopropyl alcohol is used in medical settings as a rubbing alcohol
Isopropyl alcohol, also known as propan-2-ol, isopropanol, or 2-propanol, is a colourless, flammable, organic compound with a pungent alcoholic odour. It is often used as a solvent and is produced through the hydration of propene or hydrogenation of acetone.
Isopropyl alcohol is commonly used in medical settings as a rubbing alcohol and hand sanitiser. It is an effective antiseptic, disinfectant, and bactericidal treatment, killing bacteria, fungi, and viruses. It is also used to relieve muscle aches and disinfect small objects and surfaces. Rubbing alcohol typically contains 70% isopropyl alcohol, although concentrations can vary between 70% and 90%. The concentration of isopropyl alcohol in the rubbing alcohol determines its effectiveness, with 70% being more effective at disinfecting than higher concentrations due to its slower dissolution rate and better penetration.
While isopropyl alcohol is used in medical settings, it is important to note that it is not suitable for direct application to the skin due to the risk of poisoning. Instead, diluted forms such as rubbing alcohol are recommended for home use. Rubbing alcohol is a mixture of isopropyl alcohol and water, sometimes with additional ingredients like wintergreen essential oil. It is important to follow directions and precautions when using rubbing alcohol, such as avoiding contact with the eyes and using it in a well-ventilated area.
Isopropyl alcohol poses safety risks due to its flammability and potential for peroxide formation. It can react with air and oxygen to form unstable peroxides that may explode. Additionally, both isopropyl alcohol and rubbing alcohol are toxic if inhaled or ingested, causing central nervous system depression and other symptoms such as flushing, headache, dizziness, nausea, vomiting, and respiratory depression. Therefore, it is crucial to use these substances with caution and keep them out of the reach of children.
Overall, isopropyl alcohol, known commonly as propan-2-ol, serves as a vital component in medical settings, particularly as a rubbing alcohol. Its effectiveness as an antiseptic and disinfectant makes it a valuable tool in various medical applications. However, it is important to distinguish between isopropyl alcohol and rubbing alcohol, as the former is more concentrated and hazardous, while the latter is designed for at-home use.
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Frequently asked questions
Yes, isopropyl alcohol and propan-2-ol are the same. Isopropyl alcohol is the IUPAC functional class name, while propan-2-ol is the substitutive name.
Isopropanol is another name for isopropyl alcohol.
The chemical formula for isopropyl alcohol is $(CH3)_2CHOH$.
Isopropyl alcohol is used in medical settings as a rubbing alcohol and hand sanitiser. It is also used in industrial and household applications as a solvent, and as an ingredient in products such as antiseptics, disinfectants and detergents.
Isopropyl alcohol is flammable and can cause central nervous system depression if ingested, inhaled or absorbed through the skin.
