lab_exp8 - Experiment 8: Hydrogen Phosphate Buffer System...

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Experiment 8: Hydrogen Phosphate Buffer System Chemistry 1046L
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Purpose: The purpose of this lab is to learn and understand how a buffer system works. Also this lab teaches the proper use of a pH meter while reinforces basic weighing and measuring techniques, along with proper pipetting techniques. Procedure: There were no changes to the procedure. Dillon, Stephanie. “Hydrogen Phosphate Buffer Systems.” CHM1046L Online Manual . Fall 2011. 21 September 2011. <http://www.chem.fsu.edu/chemlab/chm1046lmanual/buffers/index.html > Data: mL HCl added pH DI pH Buffer Initial pH 6.77 7.25 1 7.21 7.33 2 7.13 7.43 3 7.12 7.49 4 7.06 7.57 5 7.02 7.69 6 6.96 7.76 7 6.91 8 6.89 9 6.83 10 6.78 11 6.77 12 6.74 13 6.71 mL NaOH added pH DI pH Buffer Initial pH 7.39 7.30 1 7.15 7.43
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2 7.15 7.45 3 7.03 7.55 4 6.97 7.81 5 6.92 6 6.79 *pKa = 6.64 *After HCl was added x was calculated to be -.55 *After NaOH was added x was calculated to be .55 Calculations: Conclusion: The Buffer used was a combination of. The pH used to calculate the x values was found
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This note was uploaded on 03/16/2012 for the course CHEMISTRY 1046L taught by Professor Chaolv during the Fall '11 term at FSU.

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lab_exp8 - Experiment 8: Hydrogen Phosphate Buffer System...

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