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UCLA CHEM 14BL - exp3_w2_stu_new

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CHEM14BL Spring 2004Hint: For acid rain chemistry, read the appropriate chapter on acid rain in your generalCHEM14BL Spring 2004 Report Guideline for Experiment 3 (Vinegar Titration Week 2) You MUST turn in the pre-lab at the beginning of your lab section. Pre-lab report must be written inside the lab notebook. (I) On-line Technique Videos For This Experiment Click on the title below to download the video (require Real Player) (1) Laboratory Safety (this video was shown on the first day of the lab) (2) Solution Preparation (3) Use of a Buret Guides for Writing Lab Reports On-line resource for acid-base chemistry (II) Pre-lab Guideline (Week 2) (i) Title (ii) Reference of procedures (iii) Introduction (iv) Procedures (flowchart) (under week 2) (v) MSDS information (refer to the MSDS handouts for details) HCl (0.5M) Note: In MSDS, select the site that gives you the MSDS information closest to the concentration listed above for each individual chemical. You may have to convert the concentration units on MSDS before you decide which site to use since sometimes the unit may be reported as w/v% on MSDS. You should record the following MSDS information in your notebook for the chemicals listed above. (Printouts directly from the Web pages will NOT be accepted!!) (a) Product Name (b) Chemical Formula (c) Formula Weight (d) Melting Point; Boiling Point and Density (e) Health Hazard Data (summarize in your own words) (f) Spill and Disposal procedures (summarize in your own words)CHEM14BL Spring 2004 Report Guideline for Experiment 3 (Vinegar Titration Week 2) You MUST turn in the pre-lab at the beginning of your lab section. Pre-lab report must be written inside the lab notebook. (II) Pre-lab Guideline (Week 2) (Continued) (vi) Complete the following pre-lab study questions (see page 44): (Must show all work for FULL credit) Note: for this pre-lab, the study questions include BOTH week 1 and week 2 You may need to REVIEW the acid/base materials from chemistry 14A BEFORE working on the following questions. Also, read the lecture guides on acid/base equilibrium before attempting to solve the following questions. There are also on-line tutorials listed on this guideline for acid-base Chemistry. (I) Under WEEK 1 answer question #3 ONLY Note: you don't need to answer question 2 in order to do question #3. The two solutions that question #3 refers to are: (1) a 10-mL vinegar solution that has a concentration of 5% (w/v%) (2) a 10-mL vinegar solution that has a concentration of 5% (w/v%) together with 30mL of water Each one of these solutions is then titrated with the NaOH solution. Ka for acetic acid is listed in question #1 (II) Under WEEK 2 also complete questions #2 & #3 (vii) Data/observations (Use a NEW page for this) Read the procedure and set up data tables but leave them blank. You will complete the data tables during the lab period.CHEM14BL Spring 2004 Report Guideline for Experiment 3 (Vinegar Titration Week 2) Post-lab report must be written inside your notebook with the exception of graphs. Refer to the lab schedule for post-lab reports due date. This is a GROUP report (i.e. turn in ONE report per group). Post-lab Guideline (Week 2) (I) Write the names of your group members and their responsibility in the experiment and in writing this post-lab report (II) Data (printouts of data tables from EXCEL are acceptable) Organize data into tables and label each data table clearly with title. Your data table should include all the raw data as well as all the calculated values for the derivative graphs. (III) Graphs (Use EXCEL to plot the titration graphs) There should be a total of FOUR graphs - Prepare a full titration graph AND a first derivative graph for the combined buffer titrations for 5-ml aliquots of vinegar with HCl and NaOH. - Prepare a full titration graph AND a first derivative graph for the combined buffer titrations for 10-ml aliquots of vinegar with HCl and NaOH. Your graphs should have: - correct scales and full use of graph paper - axes (Labeled with units) - appropriate titles and labels Make sure you put EACH GRAPH ON A SEPARATE PIECE OF PAPER. CHECK THE GRIDLINES for appropriate scaling.CHEM14BL Spring 2004 Report Guideline for Experiment 3 (Vinegar Titration Week 2) Post-lab report must be written inside your notebook with the exception of graphs. Refer to the lab schedule for post-lab reports due date. (IV) Analysis - Determine the points on the combined buffer first derivative graphs that correspond to the limits of the buffer region (see buffer graphs in lecture guide). Using the value for the pKa determined from week 1 and the pH of the solution at that point of the titration, calculate the ratio of [OAc-]/[HOAc] at these points. Henderson-Hasselbach equation can be used in this region. Complete all questions in the Discussion, Application sections (skip the Evaluation section). Hint: For acid rain chemistry, read the appropriate chapter on acid rain in your general chemistry textbook . (V) Conclusion - summarize all the results - comment on the buffer limits between the two sets of buffer (i.e. 5ml and 10ml). What can you conclude?


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