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[Chemical Knowledge]：Identification of water and DMF

Read： 598 Time：19months ago Source：Transform the World with Simplicity

Water and DMF (dimethylformamide) are both common liquids, but they differ greatly in their chemical properties and uses. The correct identification of water and DMF is essential for laboratory work, as misuse can lead to biased experimental results. Therefore, the following will introduce how to distinguish water and DMF from the aspects of appearance, physical properties and chemical properties, and provide identification methods.
Appearance:
we can distinguish water and DMF from appearance. Water is a colorless transparent liquid, while DMF is a colorless transparent liquid. From the appearance point of view, the two are very similar, so it cannot be judged by appearance alone.
Physical Properties: Water and DMF can
be distinguished by physical properties. Water has a boiling point of 100 degrees Celsius, a freezing point of 0 degrees Celsius, and a density of 1g/cm3. DMF has a boiling point of 153 degrees Celsius, a melting point of -61 degrees Celsius, and a density of 0.944g/cm3. By measuring these physical properties, it is possible to help determine whether it is water or DMF.
chemical properties:
we can distinguish water from DMF by chemical properties. Water is an inorganic substance, and many substances will occur chemical reactions, such as oxidation and reduction reactions with metals, etc.; and DMF is an organic solvent, not easy to react with general inorganic substances, but can react with organic compounds to generate corresponding products.
identification method:
in addition to the appearance, physical properties and chemical properties to distinguish water and DMF, can also use the following identification methods:
1. gas chromatography-mass spectrometry: gas chromatography-mass spectrometry can quickly and accurately analyze the content of DMF in the sample, and also has high identification ability for different impurities;
2. infrared spectroscopy: infrared spectroscopy can accurately identify the characteristic absorption peaks of DMF and help identify whether the sample contains DMF;
Deuterium NMR method: Deuterium NMR method can determine whether the sample contains DMF by determining the deuterium NMR spectrum, with high accuracy.
summary:
In laboratory work, it is very important to correctly identify water and DMF. Only through scientific methods and instruments can we accurately judge. I hope that the method and identification method of distinguishing water and DMF introduced above can help you to ensure the accuracy of the experimental results.

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