What is the definition of molarity?

Molarity is defined as the number of moles of solute per liter of solution. This measurement quantifies the concentration of a solute in a given volume of solution and is expressed in units of moles per liter (mol/L). Understanding molarity is crucial in various chemical applications, such as preparing solutions for reactions, diluting concentrations, or calculating how substances interact in a chemical process.

In the context of the other options, while considerations of solvent amount or solution volume are relevant in broader discussions of solutions, they do not directly define molarity itself. Density is a distinct property that relates mass to volume but does not inform us specifically about the concentration of solute in a solution, thereby separating it from the concept of molarity.