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Acid-Base Titration

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Introduction

Acid-Base Titration Experiment #24 Aj Klatch Kyle Tisi Mr. Edmondson AP Chemistry 4/2/02 2/3 I. Abstract The purpose of the laboratory experiment was to determine equivalence points, pKa, and pKb points for a strong acid, HCl, titrated with a strong base, NaOH using a drop by drop approach in order to determine completely accurate data. The data for this laboratory experiment is as follows. Using a concentration of .1 NaOH we had the largest NaOH volume before the largest pH increase at 6.38ml. For the largest NaOH volume after the largest pH increases we used 6.73ml of base. ...read more.

Middle

Computer Data Graph: See Attached c. 23Drops From Buret = 1mL VI. Mathematics a. Stoichiometry Molarity=Moles/Volume(L) .5M NaOH=X/.00185L NaOH X=.00925 mol NaOH .00925mol NaOH * 1mol HCl/1mol NaOH=.00925mol HCl .00925mol HCl/.005L = .185M HCl b. Drop Calculations Vol/Number of Drops. 1mL/23Drops = .034mL/drop VII. Conclusion Unlike other labs, this lab allowed for the most precise titration results possible. The reason for this is that separate drops were entered one at a time and their volume was computed in order to add to the total. However, due to the fact of adding drops one at a time, time became an issue while completing the experiment. ...read more.

Conclusion

For the largest NaOH volume after the largest pH increases we used 6.73ml of base. The volume of NaOH used at the equivalence point, pH 7, was 6.575ml. The moles of NaOH used at this point were .0006575mols. Using stochiometry, the moles of HCl were also .0006575 at the equivalence point. Finally, our concentration of HCl was calculated out to be .06575 Molarity. Finally, error in this lab could be derived from many places. Simple human error is a factor in every measurement and liquid transfer which occurred throughout this exercise. Also, computer or incorrectly calibrated apparatus structures can cause data error also. However, the data achieved matches the pre-determined posted set of data, therefore, error was at a low apex. ...read more.

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