What Is Solution Concentration?

Percent solution concentration (concentration can be calculated by the number of grams of solutes, gram molecules or grams equivalents in a certain solution.) Refers to the percentage of the weight of the solute contained in the solution (usually unit solution).

It is a standard for the concentration of the solution.

The formula for calculating the percentage concentration of a solution is:

Mass percentage concentration of solution = mass of solute / mass of solution × 100%

* Where solute mass + solvent mass = solution mass. ^[1]

Contained in a unit solution

Solution concentration can be divided into three types: mass concentration (such as mass percent concentration), volume concentration (such as molar concentration, equivalent concentration), and mass-volume concentration.

Mass percentage concentration

The concentration of a solution is expressed by the percentage of the mass of the solute as the percentage of the total solution mass. For example, 25% glucose injection means 25 grams of glucose in 100 grams of injection.

concentration

Volume concentration

(1) Molar concentration The concentration of a solution is expressed by the number of moles of the solute contained in 1 liter of solution. It is called the molar concentration and is represented by the symbol mol / L. .

Molar concentration (mol / L) = moles of solute / solution volume (liter)

(2) Equivalent concentration (N)

The concentration of a solution is expressed by the equivalent concentration of the solute contained in 1 liter of the solution, which is called the symbol N.

For example, if 1 liter of concentrated hydrochloric acid contains 12.0 grams of equivalent hydrochloric acid (HCl), the concentration is 12.0 N.

Equivalent concentration = grams equivalent of solute / solution volume (liter)

Mass-volume concentration

The concentration expressed by the mass of the solute contained in a unit volume (1 cubic meter or 1 liter) of the solution is called mass-volume concentration, which is expressed by the symbol g / m³ or mg / L. For example, if 1 mass of chromium-containing wastewater contains 2 mg of hexavalent chromium, the concentration of hexavalent chromium is 2 mg / L (mg / L)

Mass-volume concentration = mass of the solute (grams or milligrams) / volume of the solution (cubic meters or liters). ^[2]