10 Then record the temperature of the ice bath 11 Make sure the level of the

10 then record the temperature of the ice bath 11

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10. Then record the temperature of the ice bath., 11. Make sure the level of the water in the flask is the same as the ice bath level. Then remove the flask by putting your finger on the stopper hole and lifting out of the ice bath. 12. Next transfer the water in the flask to a graduated cylinder and record the volume. The volume should be recorded as V cw .
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13. Lastly fill the erlenmeyer flask with water to the marked point and transfer water into graduated cylinder and record volume. This volume should be recorded as V 1 . repeat this procedure once more, make sure to get a new flask that is clean and dry. Boyle’s Law 1. First attach the gas pressure sensor to the LabQuest 2. Turn on the LabQuest 2 and set up. To set up press new from the file menu. Then attach the syringe to the gas pressure sensor at the chosen starting point (8.0 mL). Make sure to only twist the syringe half way for the best results. 2. Now set up the data collection mode in LabQuest 2. Press mode on the screen, then change the mode to events with entry. Input pressure and kPa into the system. 3. Start the data collection, hold the plunger at initial volume mark (8.0 mL), once the pressure reading stabilizes, press keep and enter the volume plus 0.8 (which is the amount of volume in the point of the syringe that is not accounted for). Now move the syringe down to the next volume (6.0 mL) and repeat til you reach volume of 2.0 mL. Once this volume is reached remove syringe and take the initial volume again. Move the syringe to 10 mL and record then to 12 mL. 4. Once all of the selected volumes are collected, choose which initial volume fits best within the graph data. Press on the table icon on the LabQuest 2 and press on the unwanted volume, an icon that says strike through data will appear, click on that. Then press the graph icon. 5. Press analyze and choose the curve fit for your graph. Then open fit equation and choose the function to perform on the data. Lastly press OK to return to graph screen and insert USB to collect data. Repeat steps if needed. Data/Observations/Results: Charles Law:
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Trial # Temp of hot water (1 ) Temp of ice bath (1 ) V cw (mL) V 1 (mL) 1 99 1 25.0 148.0 2 99 1 31.0 150.0 Boyle’s Law: Trial # Volume (mL) Pressure (kPa) 1 2 + 0.8 225.06 2 4 + 0.8 191.81 3 6 + 0.8 135.96 4 8 + 0.8 101.75 & 101.40 5 10 + 0.8 83.17 6 12 + 0.8 69.71 Calculations: Charles’ Law: 1. V 1 = 148.0mL, T 1 = 99 2. a. Trial 1: V 2 = V 1 - V cw = (148.0 - 25.0)mL = 123.0mL b. Trial 2: V 2 = V 1 - V cw = (150.0 - 31.0)mL = 119.0mL 3. Verifying Charles’ Law: V 1 /T 1 = V 2 /T 2 a. Trial 1: (148.0mL / 372.15° ) = (123.0mL / 274.15° ) = 0.398 0.449 ° mL ° mL b. Trial 2: (150.0mL / 372.15° ) = (119.0mL / 274.15° ) = 0.403 ≈ 0.434 ° mL ° mL 4. Average: a. Trial 1: = = 0.424 2 + T V T V 2 0.398 + 0.449 mL mL mL b. Trial 2: = = 0.419 2 + T V T V 2 0.403 + 0.434
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  • Fall '14
  • Pell, Wendy

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