What Is a Liquid Solvent?

A solvent is a liquid (gas, or solid) that can dissolve a solid, liquid, or gaseous solute (the solvent and solute can be solid, liquid, or gas), and then become a solution. The most common solvent in daily life is water. The so-called organic solvent is an organic compound containing carbon atoms. Solvents usually have relatively low boiling points and are volatile. Or it can be removed by distillation, leaving the dissolved matter behind. Therefore, the solvent must not react chemically with the solute. They must be inert. The solvent extracts soluble compounds from the mixture. The most common example is brewing coffee or tea with hot water. Solvents are usually transparent, colorless liquids, and most of them have a unique odor.

The concentration of the solution depends on the amount of substance dissolved in the solvent. Solubility is how much a solvent can dissolve at a specific temperature. Organic solvents are mainly used for dry cleaning (e.g.

The concentration of the solution depends on the amount of substance dissolved in the solvent;

Solvents are divided by chemical composition

Toxicity: Organic solvents are fat-soluble, so in addition to entering the body through the respiratory tract and digestive tract, they can be quickly absorbed through intact skin. After being absorbed into the body, organic solvents will act on nerves rich in lipids,

Influence of the position of the absorption band

The effect of solvents on the absorption band is related to the types of solvents, solutes and transition bands. According to the properties of both the solute and the solvent, different effects are produced. If the intermolecular interaction has a stronger stabilization effect on the excited state than on the ground state, the transitional absorption band shifts to red. Conversely, those who make the ground state more stable will shift to blue. When the solute is a non-polar molecule, the interaction with the non-polar solvent is only a weak dispersion. The effect of the solvent on the solute is often small, and the spectrum of the solution is close to the gaseous state. If the excited state of the solute has a dipole or is associated with charge transfer, the absorption band wavelength shifts to red as the dielectric constant or refractive index of the solvent increases.

Effect of UV Absorption Spectrum

When a pure compound is measured in a series of different solvents, the obtained data, including the intensity and the wavelength position of the absorption band, often vary with the solvent. Depending on the nature of the solute and the solvent, sometimes a chemical reaction may occur between the two, or a complex may be formed. The dissociation constant and tautomeric equilibrium of the solute are also related to the solvent, so that different solvents can produce very different spectra. Therefore, it is best to use the same solvent when comparing or checking the spectra of compounds. If the solvents used are different, the influence of the solvent should be considered when analyzing the spectra. In addition, the type of transition to which this band belongs can also be inferred from the difference of a certain absorption band in different solvents.

The physical interactions between solvents and solutes are

Why does every food safety incident occur because of ink? It turns out that the main culprit of ink pollution comes from the solvents it contains. Solvents act as an "intermediary" in the ink that binds pigments and adhesives to printed items. The working principle is to first mix the pigment and the solvent, dissolve into a liquid that can flow, and the liquid solvent volatilizes into a solid, so as to achieve the transfer and attachment of the pigment to the printed matter. The volatility of solvents is an important source of pollution, which not only pollutes the air and endangers the health of workshop workers. If the printing is superimposed immediately after printing, the solvent volatilizes incompletely, and consumers will also have secondary pollution during use. The above-mentioned behavior of fries on the patterned pad paper is the wrong operation method leading to secondary pollution.