Discussion exp8 - James Riddle Jr39592 Experiment 8 Tit...

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James Riddle Jr39592 Experiment 8 – Titration – Acid/Base Equilibrium and Buffers Desai, K The objectives of this experiment were to accurately conduct a weak acid – strong base titration, determine the equivalence point of a weak acid – strong base titration, and calculate the pKa and Ka of the weak acid. Titrated an acidic solution of acetic acid with a strong base, NaOH. Carefully added the NaOH from a burette and recorded the pH at certain volumes. Once a pH of about 11.5 was reached, stopped the titration and repeated the steps for a second trial. (1a) A buffer zone is a period on the titration curve when the titrated solution becomes a buffer due to the existence of the weak acid and the salt found in the weak acid in solution. For Trial 1, the buffer zone was from 5.0 mL to 17.0 mL of NaOH, so the pH range was from 3.60 to 4.70. For Trial 2, the buffer zone was from 6.0 mL to 19.0 mL, so the pH range was from 3.70 to 4.80. (2a) The equivalence point is the point at which the number of moles of the titrant equals the number of moles of the analyte. For the titration curve, draw a straight line down from the point on the curve where the slope is parallel to the y-axis. On the gran plot graph, set the two trend line equations equal to each other and solve for the
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This note was uploaded on 07/17/2011 for the course CH 204 taught by Professor Leytner during the Fall '08 term at University of Texas at Austin.

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Discussion exp8 - James Riddle Jr39592 Experiment 8 Tit...

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