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CHEM 102 Lecture Notes - Lecture 6: Significant Figures, Calibration Curve, Microsoft Excel

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cerisechinchilla795

4 Apr 2016

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Drexel University

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The handwritten lab procedure will not be included in your lab report, but it will have 5 points associated with it. Failure to submit it at the beginning of the lab to your lab instructor will result in 5 points lost. Every day that the lab report is late will also result in 5 points lost. Include your data sheet in the lab report (see instructions for how to do it in the instructions for online turnitin submission posted on the course website). You will receive a total of 25 points for the data sheet and handwritten lab procedure. You will also receive/lose up to 10 points for grammar, spelling, and language. Please use the instructions given in the treatment of the data section (in your lab manual), as well as the general grading rubrics below to write your lab report. Handwritten experimental procedure (submitted when students sign in; not more than half a page)

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Related Questions

I NEED HELP ANSWERING QUESTION 4 AND 5!!

Experimental Determination of pKa of buffers In this lab you. the student, will titrate several different buffer solutions in order to determine their pKa. Recall from class that (or from the water chemistry chapter of your textbook) that the pKa of a weak acid/base is equal to the pH of the solution when it population of molecules are 50% protonated/deprotonated. In this lab you will be given a butter solution (typically at low pH) and will titrate with 1 M potassium hydroxide (KOH) while measuring the pH during each stage of the process. You will then need to generate from your data a titration plot and then to extrapolate from there the pKa of the weak acid/base. General Procedure Tentative buffers to be tested: water (N = 1), 0.4 M Acetic Acid (N = 3), 0.4 M Glycine (N = 3), [N is the number if replicates] As in any lab put on your personal protective equipment (PPE): lab coal, safety glasses, and gloves Setup burette with 1 M KOH. Be careful not to spill. In a small beaker (100 mL or smaller) pour in 40 mL of buffer to be tested. Titrate until pH passes 12. Be consistent with your dispensing of KOH so your replicate trials line up appropriately. Tabulate and graph data (use formatting that is consistent with Lab 1 and include standard deviation in tables and graphs) Questions and concepts to address in the lab report Describe the buffering capacity of water based on your titration. How do they compare to Acetic Acid and Glycine? For Acetic Acid and Glycine Buffers: For titrations with N = 3. how can you account significant differences between data points? What were the pKas of your buffers based on your titration? How do they compare to those reported in the literature? How do you account for difference in values? Draw the three possible ionic forms of each buffer. Identify which of these predominates at pH 1, pH 6, and pH 11. What are the chemical equations that show how each buffers solutions at either pKa by consuming amounts of added hydrogen or hydroxide ions.

0.25M Na₂ S₂ O₃: 2.0M HCL