The difference between chemical purity and chemical content

Conceptually, the concentration and purity are relatively close, and the content is different.

Concentration is a more rigorous expression, commonly used in chemistry, indicating the percentage of a substance in the total total substance, and the concentration of the amount of the general substance.

The purity is relatively popular, but it is suitable for substances that are basically pure and contain a little impurity, such as the purity of gold and silver, and the content of the main body is very high.

The content is different, indicating the absolute amount of a substance, and the percentage of it cannot be seen, the content is high, but if the overall amount is large, the concentration is still very low.

Concentration should be in the question. This expression is rigorous, and purity is suitable for, for example, pure oxygen, which contains a little impurity, and it is more appropriate to say purity.

1. "Purity generally refers to the percentage of the area measured by the area normalization method of the compound, and the content of the content is measured by volume analysis (titration) or chromatographic external standard method, internal standard method, ultraviolet spectrophotometry, etc. To add, purity often refers to the amount of the subject matter after deducting water or salt.

Content refers to the percentage (%) or volume ratio or absolute quantity (e.g. **g l) of the subject matter in a unit mass of materialFor example, the ethanol content of 75% alcohol is 75% of the total mass, but its purity is related to other impurities other than water, if you use a little ethanol with no impurities, its alcohol purity is 100%; If you use ethanol containing 5% methanol, the alcohol purity is 95%.There are also differences in detection methods:

Similarly, with liquid chromatography, the percentage of area measured by the area normalization method is purity, and the internal and external standard method is measured by the content. ”

2. "Purity includes the content (or concentration) of each component in the sample, including the content (or concentration) of impurities." Content basically refers to the concentration of the main components. ”

3. "Purity refers to: refers to the amount of a substance after removing the amount of impurities in the total amount Content refers to: refers to the amount of substances contained in a substance" In addition, the units of the two are not the same, and the content is generally xxmg kg ug kg; There is no unit of purity, and it is directly expressed as xx%.

It can also be understood in this way: the content should be related to the yield, and the purity reflects the quality of the product

Chemical purity refers to the amount of a substance that removes the magazine to the total amount. For example, quartz.

Chemical content refers to: refers to the amount of substances contained in a substance, such as petroleum.

1. The nature is different.

Purity: Purity usually refers to the vividness of a color. From a scientific point of view, the vividness of a color depends on the singularity of the light emitted by that hue.

Colors that can be distinguished by the human eye with monochromatic light characteristics have a certain degree of vividness. Different hues not only differ in brightness, but also in purity. In addition, chemical reagents are also divided into purity.

Concentration: Concentration is a noun in analytical chemistry. The meaning is the concentration expressed in the number of moles of solute contained in 1 liter of solution. The physical quantity of the composition of a solution is expressed in terms of the amount of solute contained in a unit volume (moles).

This is called the molar concentration of the solute.

The amount of concentration of the substance also known as the solute.

2. The application is different.

Purity: Color Use Case: The strength of a color's purity, which refers to the degree to which the hue feels clear or ambiguous, vivid or cloudy; Industrial Use Cases:

Purity is an important indicator of quartz casing, which has a great impact on physical and chemical properties and use properties, such as impermeability, high temperature strength, softening point, light conduction, thermal stability, chemical stability, radiation resistance, fluorescence characteristics, etc.

Concentration: Blood concentration refers to the steady-state concentration of the drug in human blood; The concentration of the solution is the percentage of the mass of the solute to the mass of the total solution.

The expression is called the mass percentage concentration, which is expressed by the symbol %; For pollutants in the atmosphere, volume concentration and mass-volume concentration are commonly used to indicate their content in the atmosphere.

1. Purity: The amount of reactants relative to impurities is called purity, and impurities will change the generation of reactants or affect the efficiency of chemical reactions. The purity of a substance = the amount of the substance in the mixture 100% of the total amount of the mixture.

2. Concentration: The amount of solute relative to the solvent is called concentration, which does not change the existence of chemical properties, and there is only solute reaction in the reaction, and the solvent does not react, and the more common one is the displacement reaction;