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Online Chemistry Labs | Learning Objectives

Background:

This experiment introduces students to the mechanics of performing an acid-base titration. A measured mass of primary standard KHP is dissolved in water and titrated with a solution of NaOH added drop-wise from the burette. The pH of the solution is continuously displayed on the monitor versus the mL of added titrant. The student may hover the mouse over any point on the display to read the pH and volume. Replicate titrations are performed. Once each titration is complete, the student is led through the calculation to determine the concentration of the NaOH solution. Then the student performs another titration of an unknown HCl solution contained in the pipette to determine its concentration. The differences between the general shape of the titration curves for the weak acid KHP and the HCl are highlighted.

 Titration 1

Learning Objectives:

  1. Become familiar with the process of performing a titration.
  2. Learn how to calculate the Molarity of the NaOH titrant from the mass of KHP and the location of the endpoint.
  3. Be able to calculate the concentration of the HCl solution once the NaOH has been standardized.
  4. Be able to answer questions about the information contained in a titration curve.