What does titration help to determine in a chemical reaction?

Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a solution of known concentration. In this process, a titrant is gradually added to the solution being analyzed until the reaction reaches its end-point, which is typically indicated by a color change due to an indicator or some other measurable change.

The key aspect of titration is that it allows one to calculate the exact volume of titrant needed to completely react with the analyte in the solution. This volume is critical for determining the amount of the reactants and calculating their concentrations. Thus, the end-point volume of solutions required for a reaction is a central focus of titration, making it the correct answer.

Understanding the end-point and the associated volume provides valuable information about the stoichiometry of the reaction and allows chemists to quantify the substances involved accurately.