Solvent Mixture
Solvent Mixture - Related Videos
01:12
Solvents
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2019
A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute. A...
06:43
Rotary Evaporation to Remove Solvent
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2023
Source: Dr. Melanie Pribisko Yen and Grace Tang — California Institute of Technology Rotary evaporation is a technique most commonly used in organic chemistry to remove a solvent from a higher-boiling point compound of interest. The rotary evaporator, or "rotovap", was invented in 1950 by the chemist Lyman C. Craig. The primary use of a rotovap is to dry and purify samples for downstream applications. Its speed and ability to handle large volumes of solvent make rotary evaporation a preferred...
08:15
Self-Assembly of Gamma-Modified Peptide Nucleic Acids into Complex Nanostructures in Organic Solvent Mixtures
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Cited by 2 •
2020
This article provides protocols for the design and self-assembly of nanostructures from gamma-modified peptide nucleic acid oligomers in organic solvent mixtures.
03:27
Mixtures of Acids
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2020
The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants. A Mixture of a Strong Acid and a Weak Acid In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
08:13
Preparation of Biopolymer Aerogels Using Green Solvents
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Cited by 44 •
2016
A new way for the production of biopolymer-based aerogels by carbon dioxide (CO2) induced gelation is shown. The technique utilizes pressurized carbon dioxide (5 MPa) for the production of biopolymer hydrogels and supercritical CO2 (12 MPa) to convert gels into aerogels. The only solvents needed besides CO2 are water and ethanol.
FAQs
Changing component proportions alters the mixture’s polarity and solute solubility. A composition that better matches the chemical properties of a target contaminant can improve its transfer from water, soil, sediment, or waste into the extraction phase. Researchers therefore adjust the ratio of solvents to influence selectivity, helping distinguish desired organic pollutants from other substances present in a complex environmental sample.
Miscibility determines whether the solvents form a uniform working phase, while viscosity affects how readily the mixture moves through or contacts a sample. These properties influence whether compounds can be accessed and separated consistently during processing. Considering both helps researchers design mixtures that support reliable contaminant preparation without compromising the practical handling of environmental samples.
The boiling behavior of each component contributes to how the mixture is handled during chemical processing and analysis. It can affect solvent loss, emissions, and the conditions needed to separate or remove solvents after use. Selecting components with suitable behavior helps balance analytical performance with laboratory safety, waste management, and environmental considerations.
Researchers use these mixtures to prepare water, soil, sediment, and waste samples before contaminant analysis. The selected composition contacts the sample and supports extraction of organic pollutants from the surrounding matrix. Preparation conditions must preserve the mixture’s intended polarity, miscibility, and solubility characteristics so the resulting extract represents the compounds of interest as consistently as possible.
A mixture becomes useful when one solvent alone cannot provide the desired balance of solubility, selectivity, viscosity, or boiling behavior. Combining components allows researchers to tune these properties for a particular environmental matrix and contaminant group. This flexibility can improve the separation of organic pollutants from complex samples and support more targeted analytical preparation.
Performance must be weighed against safety, emissions, and the amount and character of solvent waste generated. A mixture that extracts contaminants effectively may still require reconsideration if its composition increases handling concerns or disposal demands. Evaluating these factors supports the development of more sustainable laboratory procedures and informs solvent selection for environmental remediation methods.