{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

6A_Lecture_3_with_ink

6A_Lecture_3_with_ink - Lecture 3 Boiling Point and Vapor...

Info icon This preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 3
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Boiling Point and Vapor Pressure Review of Acid/Base Chemistry Extraction Techniques Drying Organic Liquids Recrystallization Experiment 3
Image of page 2
Let’s do an experiment http://viscog.beckman.uiuc.edu/flashmovie/15.php Points to this video Results can vary depending upon preconceived expectations Phenomenon experienced in class is called “attention blindness”
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Properties of solutions that depend upon the number of particles, not the mass of the particles. Freezing (Melting) point depression Freezing Point total = Freezing Point solvent Δ T f Boiling point elevation Boiling Point total = Boiling Point solvent + Δ T b Osmotic Pressure Vapor Pressure
Image of page 4
Liquid Vapor Vapor Pressure: pressure a liquid exerts on environment Boiling Point: when vapor pressure equals atmospheric pressure
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
What chemical features influence boiling point? Intermolecular Forces Hydrogen Bonding VdW Forces Size of molecule (more surface area = more intermolecular forces
Image of page 6
Mohrig, page 128
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Rault’s Law ( P = P°X) P = partial vapor pressure P° = vapor pressure of pure substance X = mol fraction of pure substance in solution X A = mol A / total number of moles solution
Image of page 8
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Question: What is the partial pressure of ethanol (P°=45.00kPa, FW=46.07g/mol) if 3.00 grams of it is mixed with 3.00 grams of something unknown (FW=32.04)?
Image of page 10
But doesn’t that unknown substance also have a partial pressure that contributes?
Image of page 11

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern