POTENTIOMETRIC TITRATIONS & SOLUBILITY EQUILIBRIA
Tianyi Hu
Partner: Yiteng Zhang, Teaching assistant: Nicholas Vizenor
Lab section: Thursday 6 pm
Date: May 7, 2015

Abstract
In this experiment, the burette was used to titrate sodium chloride solution by adding different amount of silver nitrate solution. The electrochemical potential was measured by a reference electrode in order to understand the Nernst equation and calculate out experimental result of concentration of silver nitrate solution, Ksp of Ag ion, and the concentration of chloride ion in the unknown sodium chloride solution. There are four titration performed in this experiment, 2 rough titration of both 150 ppm and unknown sodium chloride solution and 2 careful …show more content…
The electrochemical potential was measured by a reference electrode in order to understand the Nernst equation and calculate out experimental result of concentration of silver nitrate solution, Ksp of Ag ion, and the concentration of chloride ion in the unknown sodium chloride solution. There are four titration performed in this experiment, 2 rough titration of both 150 ppm and unknown sodium chloride solution and 2 careful titration. After collecting data from 8 groups, the equilibrium point are approximated. Since the mole of chloride ion and silver ion are equal, the concentration of silver nitrate solution was calculated. After that, the Ksp of Ag which is equal to [Ag+]^2 at equilibrium point from both known and unknown solution careful titration was computed by using the Nernst equation and was compared with the literature value. Finally, the concentration of chloride ion was also calculate by using two different methods, volume of titration and Nernst equation.
References
1. University of California, Irvine Chemistry M3LC Schedule, POTENTIOMETRIC TITRATIONS & SOLUBILITY EQUILIBRIA, http://unicorn.ps.uci.edu/M3LC/labs/Week6LabProcPotentiometric.pdf (accessed May 5, 2015)
2. Wikipedia, Silver nitrate, http://en.wikipedia.org/wiki/Silver_nitrate (accessed May 5, 2015)
3. Wikipedia, Sodium chloride, http://en.wikipedia.org/wiki/Sodium_chloride (accessed May 5, 2015)
Statistical