Weak Acid Titration

Weak Acid Titration - PRINTED NAME: _BAILEY RICHARDS_ TAS...

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Post-Lab Data Summary Note : some questions will display a variable like "nCount" or "SyInput" instead of an actual number in the data summary. Q# Question Text 4) Scoring Scheme: 3-3-2-1 Part I. What volume in mL of 6 M acetic acid is needed to make 1L of 0.1 M acetic acid? Please express your answer to 3 significant figures. V = Your Answer: 16.70 You Scored 2 points out of 3 Possible 5) Data Entry - No Scoring Part II. How many trials for the determination of the titration curve of acetic acid by sodium hy- droxide did you perform? Trials = Your Answer: 2 No Points Possible 6) Data Entry - No scoring Part II. What was the average molarity of your NaOH solution when you standardized it with KHP in the Strong-Acid/Strong-Base titration experiment? Report your answer to 2 significant figures. M(NaOH) mol/L = Your Answer: 0.15 No Points Possible
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7) Data Entry - No scoring Part II. For each of your trials, what was the initial volume in mL of the acetic acid solu- tion that you used? Enter your data to 4 significant figures, e.g. 30.06. Your Answer: 30.02 No Points Possible Your Answer: 30.02 No Points Possible 8) Data Entry - No Scoring Part II. To answer this question, you will have had to complete the processing of your ti- tration curve data with a spreadsheet program. Using only the titration curve itself, estimate the volume in mL of NaOH to 4 significant figures required to reach the equivalence point of the curve for each of your trials. Your Answer: 48 No Points Possible Your Answer: 48.20 No Points Possible 9) Data Entry - No Scoring Part II. Using only the titration curve itself, estimate the pH at the equivalence point for each of your trials. Report your values to 3 significant figures, e.g. 8.84 Your Answer: 7.02 No Points Possible Your Answer: 7.04 No Points Possible 10) Free Response: 2 pts. Part II. In the text box provided, write a paragraph that compares and contrasts the titra- tion curves from the strong acid - strong base titration with the titration curves you ob- tained in this experiment.
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Be sure to remark upon the pH of the equivalence point for each and the slope of the curve at the equivalence point. Your Answer: The weak acid lab has a higher initial pH level because its titration curve starts at 2.67 and the strong acid-strong base titration had an initial pH of 1.32. Also, the equivalence point of the weak acid lab was also higher than the equivalence point of the strong acid-strong base lab because the pH jumped from 7.02 to 10.16 while the strong acid- strong base pH jumped from 3.49 to 9.95. The graphs seem to have the same slope.
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This note was uploaded on 03/01/2011 for the course CHE 2b taught by Professor Augustine during the Winter '07 term at UC Davis.

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Weak Acid Titration - PRINTED NAME: _BAILEY RICHARDS_ TAS...

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