Units of Concentration Solution concentration can be expressed in a variety of u

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Units of Concentration

Solution concentration can be expressed in a variety of units. The standard unit is molar (M), which is the number of moles per unit volume (mol/L). Depending on the nature of the discussion or study, it can be useful to express concentration in other units.

Dimensionless units are another common way to express concentration, where the base units effectively cancel each other. These are expressed as a percentage or parts per thousand, million, or trillion. Unless otherwise specified, dimensionless units can be assumed to be derived from the mass of one component divided by the total mass of all components. Some of these possible units of concentration are described in the below.

A solution that is 0.1 M NaCl contains 0.1 mol of NaCl in every L of solution

Unit of
concentration Equation Use molar (M) moles of soluteliters of solution Standard unit for concentration

A solution that is 0.1 M NaCl contains 0.1 mol of NaCl in every L of solution

mass percentage
(%) mass of component in sol?ntotal mass of sol?n

Explanation / Answer

Dimensionless: 29%, 231 ppb

mass/volume: 95.2ug/L, 26.5 mg/ mL

molecules/mass: 1.29 m

molecules/volume: 0.13M, 2.3 mmol/L, 0.86 mol%

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