NUMBAT OER - Open Educational Resources

1. Introduction

The term 'concentration' describes the amount of a substance contained within a know quantity of another substance. The most common use of the term is in describing solutions, where one substance (the 'solute') is dissolved in a liquid (the 'solvent'). However, concentration could also apply to mixtures.

The term 'dilution' refers to the action or effect of reducing concentration by adding more of the carrier substance (eg the solvent). In the case of a solution, adding more pure solvent increases the overall volume of the solution, whilst the quantity of the solute remains unchanged. As a result, concentration of the solute decreases.