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Experiment 2: Acid / base titration

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Experiment 2: Acid / base titration mM @ 95% confidence levelunknownc= Nikolai Skrynnikov TA: Boone Prentice Section number: 1 25 Jan 2008 (data courtesy of Ike Fehrenbacher, 2004) 1Introduction This laboratory exercise relies on a titration technique to determine an unknown concentration of monoprotic acid in solution. In the process of titration , a basic solution is gradually added to the acidic solution until complete neutralization is obtained. The end point of the titration is detected with the help of an indicator as color of the solution changes upon neutralization. By measuring the volume of the titrant required to reach the end point , it is possible to relate the concentration of the acid to the concentration of the base. In this manner, the unknown concentration can be expressed through the known concentration. The concentration determination is repeated several times in order to improve the precision of the measurements and to estimate the experimental error.

Using the distilled water for rinsing may cause (unwanted) dilution of the KHP solution, and hence it is better to wash with the same KHP solution. The situation with the Erlenmeyer flask is different. It is only important that 25 mL of KHP solution with concentration cKHP are transferred to the Erlenmeyer flask. At

  Concentrations, Dilution

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