{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Ideal_Gas_Law_teacher_Notes

# Ideal_Gas_Law_teacher_Notes - lower the mass of the gas and...

This preview shows page 1. Sign up to view the full content.

Alka Seltzer and the Ideal Gas Law – Teacher Notes This lab is a very economical way to calculate molar mass using the ideal gas law. It is far from perfect, but presents some interesting questions about sources of error. My students’ values range from a low of 28 g/mole to a high of 60 g/mole. A few groups get very good results. I try to get them to think about possible reasons for the value that they obtain. The two major areas of concern with this lab are the circumference measurement on a misshapen balloon and the loss of mass due to water spurting if the puncture is not done carefully. Using quality balloons and puncturing carefully will greatly improve results. CO 2 is soluble in water (around 1.5 grams/kg water at room temperature.) This would
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: lower the mass of the gas and the volume collected also. Deciding if this has an impact on the results is a good thought exercise for students. It provides for some interesting discussion. Some people have questioned the assumption that the pressure inside the balloon is equal to atmospheric pressure. I have found several experiments online that report that after an initial peak when the balloon first expands, the values of the pressure inside and outside a balloon are within 0.2% of each other, for the volume used in this lab. http://scipp.ucsc.edu/outreach/balloon/labs/InflationExp.htm Again, the lab is far from perfect but presents a simple, economical way to use the Ideal Gas Law to calculate the molar mass of CO 2 and discuss lab error....
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern