As stated above the indirect potentiometry follows the change of pH with

As stated above the indirect potentiometry follows

This preview shows page 1 - 3 out of 5 pages.

the determination of an end point, or in this case, the equivalence point. As stated above, the indirect potentiometry follows the change of pH with respect to the volume of titrant added in the solution, thus making it possible to plot the titration curve and easily determining the equivalence point of the solution. The endpoint in potentiometry is indicated at the largest potential breaks, therefore the value of the exact potential is unnecessary and only the change of the cell potentials is needed. The approximate equivalence point may be determined when the pH had undergone a radical change and this may indicate that the solution is near to its endpoint. In the experiment, the pH meter’s electrode is immersed in the solution while it is being titrated with NaOH solution. A magnetic stir bar was used to stir the solution constantly to distribute the titrant evenly throughout the solution containing the KHP analyte. In trial 1, the titrant is added with one mL increments.
Image of page 1

Subscribe to view the full document.

0.00E+00 5.00E+00 1.00E+01 1.50E+01 2.00E+01 2.50E+01 5 6 7 8 9 10 11 12 8.06 Trial 1: Titration Curve Volume of NaOH, mL pH value Figure 1: Titration Curve of Trial 1 With this graph, the approximate equivalence point is determined at the corresponding volume in which a radical change of pH has occurred, in this case, at 20mL. Now, for trial 2, the increments of the added titrant in the analyte solution decrease as it approaches the approximate equivalence point, thus, giving the graph shown below.
Image of page 2
Image of page 3
  • Fall '17
  • Sir Jaden Smith
  • pH, KHP, Potentiometry

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes