Hexane
Hexane - Related Videos
14:32
Thin-Layer Chromatography - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Effects of Mobile Phase Composition on Compound SeparationExpand In this section of the lab, you will use TLC to compare how well pure hexane and a mixture of 60% hexane and 40% ethyl acetate can separate phenol, benzoic acid, and butyl phenyl ether by measuring the distance the compound traveled in each solvent. Before starting the lab, put on a lab coat, safety glasses, and nitrile gloves.
06:19
Thin-Layer Chromatography - Instructor Prep
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2020
Source: Lara Al Hariri at the University of Massachusetts Amherst, MA, USA Preparation of SolutionsExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. Before getting started, put on a lab coat, safety glasses, and nitrile gloves. You'll be working with hexane, ethanol, and ethyl acetate, which all permeate thin nitrile gloves within minutes, so change your gloves promptly if you get any solvent on them.
09:52
UV-Vis Spectroscopy of Dyes - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Absorbance Wavelength ComparisonExpand In the first part of the lab, you'll use ultraviolet and visible light absorption spectroscopy, or UV-Vis absorption spectroscopy, to analyze the absorption characteristics of fluorescein, β-carotene, and indigo dye. To perform UV-Vis spectroscopy, you'll place a solution between a light source and a photodetector. The molecules will absorb light at...
09:10
Experimental Protocol for Biodiesel Production with Isolation of Alkenones as Coproducts from Commercial Isochrysis Algal Biomass
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Cited by 8 •
2016
Detailed methods are presented for the production of biodiesel along with the co-isolation of alkenones as valuable coproducts from commercial Isochrysis microalgae.
02:34
Vapor Pressure
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2020
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
FAQs
Its nonpolar character determines which solutes it can dissolve. London dispersion forces provide the main attraction between hexane and many nonpolar organic compounds, while polar water interacts poorly with it. This selectivity makes the solvent useful when a mixture contains an organic component that must be separated from water or another phase.
Water immiscibility lets hexane occupy a distinct liquid phase rather than blend uniformly with an aqueous phase. During liquid-liquid extraction, that phase can dissolve compatible nonpolar organic compounds, allowing them to be separated from water-based material. The outcome depends on the solvent’s nonpolar character and the compound’s affinity for it.
Rapid evaporation is both a practical advantage and a handling concern. After hexane has served as a solvent in extraction, sample preparation, or chromatography, its volatility can help remove the solvent efficiently. The same property increases the importance of controlled handling and ventilation, especially because the material is also flammable.
Hexane provides a separate organic phase that can dissolve many nonpolar compounds in a mixture. When paired with a water-containing phase, this difference in solubility supports transfer of compatible compounds into the hexane layer and helps separate them from water-based components. The approach is therefore useful for isolating nonpolar organic material.
In plant-oil processing, hexane’s main contribution is solvent-based handling of nonpolar organic material. Its ability to dissolve many nonpolar compounds supports the processing of plant oils, while its volatility can aid later solvent removal. These same properties do not eliminate safety requirements: flammability, neurotoxicity concerns, ventilation, and environmental control remain relevant.
Hexane can act as an organic solvent during sample preparation and as a solvent in chromatographic separations. Its nonpolar character helps handle nonpolar organic compounds, while rapid evaporation can support removal after processing. These advantages make it relevant when researchers need solvent-based preparation or separation without strong mixing with water.
Use should be planned around controlled handling, adequate ventilation, and measures that limit environmental release. Flammability creates an immediate handling concern, while neurotoxicity concerns affect exposure management. Because less hazardous solvent alternatives may be available, researchers should weigh hexane’s solvent performance and rapid evaporation against these health, safety, and environmental considerations.