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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Chemistry 5.310 DATA SUMMARY SHEET Fall 2005 Student name: ________________ TA name: _________________ Group: A B C D (Please circle) Section: MW / TR (Please circle) EXPERIMENT 1: UNKNOWN AMINO ACID Unknown number Experimental Average equivalent Identity of the melting point of the weight of the amino acid derivative derivative Crude: 1st try: Recrystallized: 2nd try: 3rd try: (If you did not identify the unknown on the first try, please comment on any difficulties on the reverse.) Yield of derivative Crude: Limiting reagent Theoretical yield Percent yield * ** Recrystallized: *Based on limiting reagent. ** Based on crude used in recrystallization. Titration 1 Titration 2 Titration 3 Calculated equivalent weight each titration with error propagation (Report additional titrations on reverse.) reading the buret mass endpoint location Estimated uncertainty in measurement Average propagated error in equivalent weight: ____________________ 95% Confidence limits of mean equivalent weight: ____________________ Concentration of NaOH: _______________ MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Chemistry 5.310 DATA SUMMARY SHEET Fall 2005 Student name: ________________ TA name: _________________ Group: A B C D (Please circle) Section: MW / TR (Please circle) EXPERIMENT 2: FERROCENE Yield of ferrocene from synthesis Limiting reagent Yield of ferrocene after sublimation Theoretical yield Percent of ferrocene recovered by sublimation (based on mass sublimed) Percent yield Percent yield pure ferrocene (based on theoretical yield) Acetylation reaction: time: ____________ temperature: _____________ Crude yield of acetylation reaction: _____________ Observations TLC (including Rf values, solvent systems): Please provide in table form on the reverse. Was diacetylferrocene observed? _____________ (Add details to reverse) Solvent system used for column chromatography: ____________________ Yield of acetyl ferrocene (after column) Limiting reagent in the acetylation reaction Theoretical yield (assume only product is acetylferrocene) Percent yield (assume only product is acetylferrocene) Mass of unreacted ferrocene recovered by chromatography: ______________ Percent of ferrocene used in acetylation reaction recovered (unreacted) ______ crude sublimed acetylation purified ferrocene ferrocene product -crude acetylferrocene melting point MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Chemistry 5.310 DATA SUMMARY SHEET Fall 2005 Student name: ________________ TA name: _________________ Group: A B C D (Please circle) Section: MW / TR (Please circle) EXPERIMENT 3: ESSENTIAL OILS Unknown number Identity of Unknown Oil Pressure on Manometer Temperature predict limonene distillation 1st fraction 2nd fraction Temperature predict carvone distillation 3rd fraction Temperature range Approximate volume Pure carvone Pure limonene Oil (before separation) Refractive index -OVER- Limonene fraction Carvone fraction Oil (before separation Gas chromatography Percent limonene Percent carvone Percent limonene Percent carvone Percent limonene Percent carvone Refractive Index Limonene fraction Gas chromatography Refractive Index Carvone fraction Gas chromatography Refractive Index Yield of semicarbazone derviative Limiting reagent Melting point semicarbazone derivative Theoretical yield Optical rotation semicarbazone derivative Percent yield Specific rotation semicarbazone derivative MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Chemistry 5.310 DATA SUMMARY SHEET Fall 2005 Student name: ________________ TA name: _________________ Group: A B C D (Please circle) Section: MW / TR (Please circle) EXPERIMENT 4: KINETICS molar absorptivity (ε) ko Z1Z2 MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Chemistry 5.310 DATA SUMMARY SHEET Fall 2005 Student name: ________________ TA name: _________________ Group: A B C D (Please circle) Section: MW / TR (Please circle) EXPERIMENT 5: POTENTIOMETRIC TITRATIONS Unknown number HCl concentration H3PO4 concentration Titration 1 Titration 2 Titration 3 reading the buret mass endpoint location NaOH concentration Standardization of NaOH: Calculated NaOH concentration for each titration Estimated uncertainty in measurement Average propagated error in NaOH concentration: ____________________ 95% Confidence limits of mean NaOH concentration: ___________________ -over- Potentiometric titrations: Titration 1 Titration 2 Titration 3 Calculated H3PO4 concentration each titration 95% Confidence limits of mean H3PO4 concentration: ___________________ Titration 1 Titration 2 Titration 3 Calculated HCl concentration each titration 95% Confidence limits of mean HCl concentration: ____________________ Estimation of pK1 Calculation of pK2 Endpoint HCl titration Volume NaOH added pH Estimation of pK3 First equivalence point H3PO4 titration Second equivalence point H3PO4 titration
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