Lab Report 9 ch.docx - Experiment 9 Weak Acids and Buffers...

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Experiment 9Weak Acids and BuffersGRADING RUBRICThe lab report packet for this experiment should consist of the following:1.(15 pts)PRE-lab notebook pages2.(10 pts)IN-lab & POST-lab notebook pages2.1. Experimental procedure2.2. Recorded experimental values and the file name (as saved on your USB drive)2.3. Observations if any were noted2.4. POST-lab notebook pages should be attached as appropriate; might contain, for example, detailed calculations, or anything written down after the lab was over.3.(75 pts)The WORKSHEET3.1. Tables with captions3.2. Figures of graphs with captions in the right positions3.3. Detailed calculations (may be hand-written in the POST lab notebook pages; clearly refer to these while answering the worksheet3.4. Complete (full sentence) answers to the discussion questions (DQ; may be listed by DQ#s)Complete this worksheet, print, and attach to your lab report packet.Feel free to adjust space in this document as needed. Submit the worksheet document online to Canvas AND in print to your TA. Print the summary of the similarity report (the last page in the “current view” file is enough) and attach to the lab report packet.NOTE about the FILE SIZE for electronic submissions:If your final document is too large and upon upload to Canvas you get the message that “your file is too big to upload” you can resolve that, for example, by: reducing the resolution of your graphics, saving the document asa text (.docx) file instead of a .pdf file, etc.PRE-LAB notebook pages – 15 pts – point breakdown1.(2 pts)Purpose: 2.(2 pts)Objectives:3.(2 pts)List of compounds (reactants, reagents, solvents, etc. with the correctconcentrations)4.(1 pts)List of equipment 5.(2 pts)Chemical and physical hazards6.(4 pts)Properly balanced chemical equations (2 sets: formula unit, total and netionic)1A. M. Bohnsack Fall 2018 (revised Z. Baranová)
Grading Rubric – Weak Acids and Buffers7.(2 pts)Experimental OUTLINEIN-LAB & POST-LAB – 10 ptsStudents have been instructed to record everything – procedure, unknown number,observations, results, sample calculations, etc. If you notice something missing, deductpoints, and remember to be fair and consistent.1.complete experimental procedure2.detailed observations3.mention of the electronic files (three parts, multiple trials)4.one detailed example for every type of calculationsRESULTS & DISCUSSION QUESTIONS – 75 pts(10 pts)Include any/all relevant figures (titration curves and second derivative curves).Include appropriate captions.(1 pt each)Titration curves (5) are included and are properly labelledand with captions.(1 pt each)Second derivative curves (5) are included and are properly labelledand with captions.Discussion Questions(Data Analysis calculations are detailed below)1.(4 pts) Using the average pH at the half-equivalence point from the acetic acid titrations(Table 1), determine the pKaof the acetic acid solution. How was the pKadetermined?Include the three titration curves and three second derivative curves from the Part AData Analysis. Figure 12A. M. Bohnsack Fall 2018 (revised Z. Baranová)

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