Data:
Mass of alka seltzer- 10.07 grams
Circumference of balloon- 38 cm
Volume of water that fits in balloon- 1066 mL
Room Temp. - 20 degrees celsius
Barometric pressure- 759.2 mmHg
1. Discuss an area in this lab where experimental error may have occurred.
The water residue that was left inside the balloon when we rinsed it may have mad our measurements inaccurate. Also we had difficulty transferring all of the alma shelter powder into the balloon so we may not have had all of the residue in the reaction.
2. Choose one error from above and discuss if it would make 'n' the number of moles of CO2 too big or too small.
Spilling the powder and not having all of it in the reaction may have caused our calculations to yield a lower the number of moles than what it actually was.
3. Calculate the volume of the balloon mathematically using the circumference you calculated in cm.
The actual volume of the volume of the gas that filled the balloon is 926.62
4. Compare you answers to #3 to the volume obtained by filling the balloon with water. Is it close? Which do you feel is more accurate and why?
They were off but still relatively close. The calculation is more accurate because experimental measurements may have been inaccurate.
5. List two differences between a real gas and an ideal gas.
Real gases have volume while ideal gases don't. Also, we assume that ideal gases have no intermolecular forces but in reality real gases do.
6. Would the CO2 you collected in this lab be considered ideal?
No, because the gas that we found has volume, and although they are weak, they have intermolecular forces.
Advanced Questions:
1. The mass of the CO2 in grams was 2.062 g with the citric acid as the limiting reagent.
2. Our percent yield was 92.14%
3. Because some of the CO2 dissolved, the n-value we found may be a little less than the actual amount of moles.
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