TAMU CHEM 101 - EXP 11 (4 pages)

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EXP 11



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EXP 11

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Pages:
4
School:
Texas A&M University
Course:
Chem 101 - Fund Of Chemistry I
Fund Of Chemistry I Documents

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Leen Alyaseen Summary of Results In this experiment we observed the kinetics of an SN1 solvolysis reaction and how changing the solvent polarity affected the rate of reaction Each solution was placed on a magnetic stirrer and we recorded the volume of NaOH that we added to the solution The time and volume were both recorded each time the solution turned green meaning that enough HCl had formed to neutralize the NaOH For the first Kinetic Run 1 Buret Reading Time sec t tn t0 sec V0 14 80 mL 0 000 0 0 V1 15 80 mL 93 00 93 00 V2 17 80 mL 392 0 392 0 V3 19 80 mL 682 0 682 0 V4 21 90 mL 974 0 974 0 V5 23 90 mL 1218 1218 V 32 05 mL For the second Kinetic Run 2 V Vt 17 25 mL 16 25 mL 14 25 mL 12 25 mL 10 15 mL 8 960 mL V V0 V Vt 1 000 mL 1 061mL 1 210 mL 1 400 mL 1 700 mL 1 920 mL ln V V0 V Vt 0 000 mL 0 05800 mL 0 1900 mL 0 3300 mL 0 5300 mL 0 650 mL Buret Reading V0 14 80 mL V1 15 90 mL V2 17 80 mL V3 19 90 mL V4 22 00 mL V5 23 90 mL V 32 25 mL V Vt 17 45 mL 16 35 mL 14 45 mL 12 35 mL 10 25 mL 8 350 mL V V0 V Vt 1 00 mL 1 060 mL 1 210 mL 1 410 mL 1 710 mL 2 080 mL ln V V0 V Vt 0 000 mL 0 05820 mL 0 1910 mL 0 3430 mL 0 5360 mL 0 7320 mL Time sec 0 000 0 4500 132 6 240 6 316 2 394 2 t tn t0 sec 0 000 0 4500 132 6 240 6 316 2 394 2 Errors One common error was not recording the time at the exact second that the solution turned green A couple of the times we stopped the timer a little bit after it turned green so this could have altered our results Students setting their magnetic stirrer at a higher rate could also increase the rate of reaction Also if the timer was not started right when the HCl was added it would alter all of the results Conclusion The results reveal that Kinetic Run 2 had a faster rate than Kinetic Run 1 On the graphs below we plotted the values of ln V V0 V Vt vs time in seconds It is shown that the slope or rate constant of 1 was 0 00053 and the slope of 2 was 0 0018 Since 2 had a higher rate constant it had a higher reaction rate This makes sense since 2 contained 60 water making it a more polar solvent The more polar the solvent the faster the dissociation



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