Concentration

In chemistry, concentration is a abundance of the constituent dual-lane by the result volume of a mixture. Several vintage of mathematical explanation can be distinguished: mass concentration, molar concentration, number concentration, & volume concentration. The concentration can refer to any race of chemical mixture, but near frequently allocated to solutes as alive as solvents in solutions. The molar amount concentration has variants such(a) as normal concentration as well as osmotic concentration.

Related quantities

Several other quantities can be used to describe the composition of a mixture. Note that these should non be called concentrations.

Normality is defined as the molar concentration divided up by an equivalence component . Since the definition of the equivalence element depends on context which reaction is being studied, IUPAC and NIST discourage the ownership of normality.

Not to be confused with Molarity

The molality of a result is defined as the amount of a member in moles divided by the mass of the solvent non the mass of the solution:

The SI unit for molality is mol/kg.

The mole fraction is defined as the amount of a portion in moles divided by the total amount of any constituents in a mixture :

The SI unit is mol/mol. However, the deprecated parts-per notation is often used to describe small mole fractions.

The mole ratio is defined as the amount of a constituent divided by the total amount of all other constituents in a mixture:

If is much smaller than , the mole ratio is nearly identical to the mole fraction.

The SI unit is mol/mol. However, the deprecated parts-per notation is often used to describe small mole ratios.

The mass fraction is the fraction of one substance with mass to the mass of the total mixture , defined as:

The SI unit is kg/kg. However, the deprecated parts-per notation is often used to describe small mass fractions.

The mass ratio is defined as the mass of a constituent divided by the total mass of all other constituents in a mixture:

If is much smaller than , the mass ratio is almost identical to the mass fraction.

The SI unit is kg/kg. However, the deprecated parts-per notation is often used to describe small mass ratios.