In titration analysis, what is the measured quantity?

• A. The volume of the sample.
• B. The amount of standard solution added.
• C. The color change of the indicator.
• D. The initial concentration of the analyte.

Answer: (B)

In titration, you quantify how much titrant you have to add to the analyte until the reaction is complete. That means the measured quantity is the volume (and thus the amount in moles) of the standard solution added from the burette. The endpoint color change from the indicator is just a signal to stop, not the quantity being measured. The initial concentration of the analyte isn’t measured directly either; it’s determined afterward using the amount of titrant added and the reaction’s stoichiometry. The volume of the sample isn’t the recorded measurement in titration. So the best answer is the amount of standard solution added.