Unknown sample is reacted with a known solution in the presence of an indicator. This describes which analytic approach?

Unknown sample is reacted with a known solution in the presence of an indicator. This describes which analytic approach?

• A. Chromatographic
• B. Volumetric/titrimetric
• C. Electrochemical
• D. Volumetric fotometric

Answer: (B)

This describes titration, a volumetric analysis. You have an unknown sample containing the analyte and you add a solution of known concentration (the titrant) until the reaction is complete, with an indicator showing the endpoint by a visible color change. The key idea is using the known titrant quantity to determine how much analyte is present, based on the reaction’s stoichiometry. This approach is different from chromatographic methods, which separate components rather than quantify by a reaction with a standard solution and an indicator. It’s also distinct from electrochemical methods, which rely on electrical signals rather than a color-change endpoint. Some titrations can be monitored photometrically, but the classic description—adding a standard solution and watching for an indicator color change—points to volumetric/titrimetric analysis.

This describes titration, a volumetric analysis. You have an unknown sample containing the analyte and you add a solution of known concentration (the titrant) until the reaction is complete, with an indicator showing the endpoint by a visible color change. The key idea is using the known titrant quantity to determine how much analyte is present, based on the reaction’s stoichiometry.

This approach is different from chromatographic methods, which separate components rather than quantify by a reaction with a standard solution and an indicator. It’s also distinct from electrochemical methods, which rely on electrical signals rather than a color-change endpoint. Some titrations can be monitored photometrically, but the classic description—adding a standard solution and watching for an indicator color change—points to volumetric/titrimetric analysis.