Final answer:
The term 'concentration' refers to the amount of solute in a given volume of solvent, with molarity being a common unit of concentration, expressed as moles of solute per liter of solution.
Step-by-step explanation:
The quantity that describes the concentration of matter is a measure of how much solute is present in a given volume of solvent. Chemists utilize various methods to express this concentration such as molarity, which is defined as moles of solute per liter of solution. It is a quantitative measure of the relative amounts of solute and solvent present in a solution, and the term 'concentration' itself refers to the amount of a substance dissolved in a given volume of liquid.
For example, molarity is frequently used in chemistry to describe solution concentrations, especially for reactions that occur in solution. Molarity is a useful concept because it directly relates the number of moles of solute to the volume of solution, thereby indicating the strength of the solution.