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Chemistry · Glossary

What is Molar concentration?

Definition 26.6 School Chemistry — Grades 1 to 12 · Chapter 26 — Concentration and Dilution

The molar concentration cc of a solute in a solution is the amount of dissolved solute per volume of solution:

c=nsoluteVsolution,c = \frac{n_{\text{solute}}}{V_{\text{solution}}},

in moles per litre (mol/L\mathrm{mol}/\mathrm{L}).

Examples

Example 26.8 (The drip bag in moles)

The drip bag holds 9.0 g/L9.0\,\mathrm{g}/\mathrm{L} of sodium chloride, of molar mass 58.5 g/mol58.5\,\mathrm{g}/\mathrm{mol}. Its molar concentration is

c=CmM=9.0 g/L58.5 g/mol=0.154 mol/L.c = \frac{C_m}{M} = \frac{9.0\,\mathrm{g}/\mathrm{L}}{58.5\,\mathrm{g}/\mathrm{mol}} = 0.154\,\mathrm{mol}/\mathrm{L}.

The manufacturer’s label gives the same figure the other way round: 154 thousandths of a mole of sodium ions per litre.

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