Experiment Determination of the Equilibrium Constant for an Esterification Reaction
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1 Experiment Determination of the Equilibrium Constant for an Esterification Reaction CHEM 220 Laboratory Manual 2012 Revision p. 1
2 6 M H 2 SO 4 (sulfuric acid) Titrations to monitor Reaction Progress (Q) Calculate Q. Repeat approximately weekly until equilibrium is reached. Dispose of in the proper waste containers. CHEM 220 Laboratory Manual 2012 Revision p. 2
3 Data Tables and Analysis ESTERIFICATION DATA Volume of ethanol: Volume of water: Mass of : Concentration of NaOH solution: Table: Titrations Data Day 0 H 2 SO 4 correction Day Day Day Final Burette Reading (ml) Burette Reading (ml) Volume NaOH (ml) Mole NaOH (mol) H + present from catalyst: Esterification Analysis I-C-Q table CH 3 CO 2 H + CH 3 CH 2 OH ó CH 3 CO 2 CH 2 CH 3 + H 2 O Calculate from initial titration Change X (determined from change) X + X + X Current reaction conditions Calculate from the titration of the current week (with correction for H 2 SO 4 ) Calculate Calculate Calculate CHEM 220 Laboratory Manual 2012 Revision p. 3
4 HYDROLYSIS DATA Volume of ethanol: Volume of water: Mass of ethyl acetate: Concentration of NaOH solution: Titrations data Table: Titrations Data Final Burette Reading (ml) Burette Reading (ml) Volume NaOH (ml) Mole NaOH (mol) Day 0 H 2 SO 4 correction H + present from catalyst: Day Day Day Hydrolysis Analysis I-C-Q table CH 3 CO 2 H + CH 3 CH 2 OH ó CH 3 CO 2 CH 2 CH 3 + H 2 O 1 / 10 of mole in overall reaction mixture Change + X (determined from change) + X X X Current reaction conditions Calculate from the titration of the current week (with correction for H 2 SO 4 ) Calculate Calculate Calculate CHEM 220 Laboratory Manual 2012 Revision p. 4
5 Additional Instructions and Mini-report guidelines for Determination of the K of an Esterification / Hydrolysis Reaction. PRELAB Heading Purpose (including the balanced equation) Procedure Summary / Strategy DATA TABLES (on a new page, not to be turned in until after the experiment) DATA REPORTING & COLLECTION In lab, add your data to the class data set as instructed. Obtain the full class data for the analysis described below. Obtain data only from another student who carried out the reaction in the opposite direction. Analyze as described below. LAB REPORT Data / Calculations/ Results Please present all lab data collected in organized tables. Please show the I-C-Q tables for all three observations, with the complete reaction and all appropriate values. Please show all calculations for one of the three I-C-Q tables, including the initial conditions, change and current conditions. Present the data collected by another student for one trial of the reaction observed in the opposite direction. Prepare an ICQ table and show all calculations for the trial. Present class data with appropriate analysis (averages and standard deviations for the Q s determined for week 4 for the esterification and hydrolysis directions separately). Please make sure that all of the above are neat and easy to read without significant cross-outs. Recopy if necessary. Discussion / Post-Lab Questions Please answer the following questions in your report NOT on this sheet. 1. Has the reaction reached equilibrium? Explain. 2. What could we have done to make the reaction reach equilibrium more quickly? Explain. 3. Would changing the amount of catalyst have caused the K for the reaction to be different? Explain. 4. Using the K (or Q) value from your final trial, calculate the equilibrium number of moles for all species if the reaction were started with 3.0 mmol of each species in the reaction. CHEM 220 Laboratory Manual 2012 Revision p. 5
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