the determination of an end point, or in this case, the equivalence point. As stated above, the indirectpotentiometry follows the change of pH with respect to the volume of titrant added in the solution, thusmaking it possible to plot the titration curve and easily determining the equivalence point of thesolution.The endpoint in potentiometry is indicated at the largest potential breaks, therefore the value of theexact potential is unnecessary and only the change of the cell potentials is needed. The approximateequivalence point may be determined when the pH had undergone a radical change and this mayindicate 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 withNaOH solution. A magnetic stir bar was used to stir the solution constantly to distribute the titrant evenlythroughout the solution containing the KHP analyte. In trial 1, the titrant is added with one mLincrements.
Subscribe to view the full document.
0.00E+005.00E+001.00E+011.50E+012.00E+012.50E+01567891011128.06Trial 1: Titration CurveVolume of NaOH, mLpH valueFigure 1: Titration Curve of Trial 1With this graph, the approximate equivalence point is determined at the corresponding volume in whicha radical change of pH has occurred, in this case, at 20mL. Now, for trial 2, the increments of the addedtitrant in the analyte solution decrease as it approaches the approximate equivalence point, thus, givingthe graph shown below.
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.
Temple University Fox School of Business ‘17, Course Hero Intern
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.
University of Pennsylvania ‘17, Course Hero Intern
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.
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 )