CHEM14BL Spring 2006 Report Guideline for Experiment 3 Vinegar Titration Week 2 The pre lab report must be written in the lab notebook I On line Technique Videos and Resources 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 Report 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 Web pages will NOT be accepted for grading Important Reference the site i e write down the URL address that you used for each of the chemical a b c d e Product Name Chemical Formula Formula Weight Melting Point Boiling Point and Density Health Hazard Data summarize in your own words f Spill and Disposal procedures summarize in your own words CHEM14BL Spring 2006 Report Guideline for Experiment 3 Vinegar Titration Week 2 The pre lab report must be written in the lab notebook II Pre lab Guideline Week 2 Continued vi Complete the following pre lab study questions see page 44 You 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 do not 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 separately 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 2006 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 Before attempting to work on the group post lab report please take a moment and read the following items carefully Definitions of Group Report and or Group Experiment 1 All members in the group MUST contribute equally when working on the experiment as well as writing the post lab report 2 Each group member must prepare ahead of time when writing the reports This means review materials from lectures or from your Chemistry textbook or from on line resources on certain topics that are relevant to the concepts when writing the reports Contribution to the group work is meaningless if a group member does not understand the concepts behind the experiment 3 It is the responsibility of the group members to plan ahead on when they should get together to work on the report In other words maintain good communication between group members 4 It is the responsibility of each group member to honestly describe the work that they did during the experiment and in writing the report No one should take advantage of the other group member Report to the course instructor or your TA if you feel that other group members are taking advantage of your work 5 Each member in the group MUST understand the concepts behind the ENTIRE experiment regardless of which portions of the report or experiment a person is responsible for This is especially important for the exams CHEM14BL Spring 2006 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 responsibilities 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 experimental data that you collected in the lab 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 the full use of the page 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 The volume scaling for the gridlines on the expanded graphs should reflect the precision of the volumetric glassware i e the buret that you used in the lab IV Analysis Using the first derivative graphs of the combined buffer titrations determine the points 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 The Henderson Hasselbach equation can be used in this region Complete all questions in the Discussion and 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 of the buffer titrations comment on the buffer limits between the two sets of buffer titrations i e 5ml
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