Which quantity is directly measured during a titration?

During a titration, the volume of the titrant added to the analyte is the quantity that is directly measured. Using a burette, the precise volume of titrant can be dispensed and recorded as the reaction progresses until the end point is reached. This measured volume is crucial for calculating the concentration of the unknown solution based on the stoichiometry of the reaction.

Mass is typically not directly measured during titration since titration is primarily focused on volume changes. While concentration and density are related to the results of the titration, they are not directly measured during the process itself. Concentration may be calculated after the titration is complete, based on the volume of titrant used and the known concentration of the titrant, but it is not a quantity that is measured in real-time. Likewise, density is a property derived from mass and volume but is not directly measured in the context of a titration. Thus, the direct measurement of volume is key in the titration process.