In this lecture Professor Goldwhite will guide you through Colligative Properties, Colloids, and Surfactants. First, you will learn about Colligative Properties and using Raoult's Law in calculating Mole Fraction and Molar Mass. Next you will learn about Boiling Point Elevation and Freezing Point Depression, as well as Vapor Pressure. Following that, you will learn how to calculate the Molar Mass from the Elevation and Depression with an example using Water and Cystine. Next you will learn about Van der Waals' Alpha Factor before delving into Osmosis with an example of Blood being Isotonic, Hypertonic, or Hypotonic. Osmotic Pressure as well as calculating the Molar Mass from Osmotic Pressure are next followed by Colloids and the Tyndall Effect which involve Light Beams through Solutions and Colloidal Suspensions. Lastly, are Surfactants, Soaps, and Detergents.
properties of solutions properties depending on number of
particles (ions, molecules) dissolved
Law of vapor pressure lowering: vp = vpo(mol. frac.
of b.p. and depression of f.p. similar: DT = K(molality)
these to determine molar masses of solutes
der Ws alpha: anomalous results due to ionic dissociation
flow of solvent across semipermeable membranes; example red
Pressure, PV =nRT where R is usual gas constant
osmotic pressure to determine molar masses of large molecules like
particles larger than ions/molecules but not large enough to settle
effect: colloids scatter light
and surfactants: hydrophilic head and hydrophobic tail
Colligative Properties, Colloids, Surfactants
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
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