What is typically measured by molarity in a solution?

Molarity is a measurement that focuses on the concentration of a solute in a given solution. It is defined as the number of moles of solute per liter of solution. This unit of concentration allows chemists to understand how much solute is present in a specific volume of solvent, enabling them to make predictions about chemical reactions, dilutions, and the properties of the solution.

The other options pertain to different properties of solutions: Volume of liquid relates to how much space a liquid occupies, temperature indicates how hot or cold a solution is, and viscosity measures the thickness or resistance to flow in a liquid. None of these parameters define the concentration of a solute, which is why they are not relevant to the question regarding molarity.