What is a titration?
A. A lab procedure used to determine the concentration of an unknown solution by reacting it with a solution of known concentration.
Why is a titration needed instead of solving some stoichiometry problems on paper?
A. Because the volume of one reactant is unknown and must be measured experimentally.
What is the analyte?
A. The solution of unknown concentration being tested (in the flask).
What is the titrant?
A. The solution of known concentration added from the burette.
What piece of equipment is used to deliver the titrant accurately?
A. A burette
What is standardization?
A. The process of determining the exact concentration of a solution by reacting it with a standard solution.
Why must strong acids and strong bases be standardized?
A. Their concentrations change over time.
What is the purpose of an indicator in a titration?
A. To signal the completion of the reaction by a sudden color change.
What is the endpoint of a titration?
A. The point where the indicator changes color, showing the reaction is complete.
What is the equivalence point?
A. The exact volume of titrant needed to completely react with the analyte.
How many trials are needed for accurate titration results?
A. At least 3 trials within 0.20 mL of each other.
Q13. In a titration, where is the sample placed?
A. In the flask.
In a titration, where is the titrant placed?
A. In the burette.
What is a titration curve?
A. A graph of pH versus volume of titrant added.
What is the pH at the equivalence point for a strong acid–strong base titration (25°C)?
A. pH = 7
What does the first point on a titration curve represent?
A. The initial pH of the sample.
What happens to pH near the endpoint?
A. The pH changes very rapidly.
What does “overtitration is asymptotic to the pH of the titrant” mean?
A. After the endpoint, the pH approaches the pH of the excess titrant.
When is an indicator appropriate to use?
A. When its color change range includes the pH at the endpoint.
Why are pH meters sometimes preferred over indicators?
A. They are more convenient and provide precise pH measurements.
Q25. If the endpoint occurs at pH 9.0, what kind of indicator should be used?
A. An indicator whose color-change range includes pH 9.0.
What is a titration curve?
A. A graph of pH versus volume of titrant added.
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Q17. What is the shape of a titration curve?
A. S-shaped.
Q18. What is the pH at the equivalence point for a strong acid–strong base titration (25°C)?
A. pH = 7.
