In class notes for October 26, 2007

In class notes for October 26, 2007 - In class notes for...

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General Chemistry Lecture 102a In class notes for October 26, 2007 Last Lecture o Boiling point elevation o i = van’t Hoff o = degree of dissociation Today o Freezing Point Depression o Osmotic Pressure See A Freezing point depression o Draw a phase diagram, see B o ∆T f = (T f(soln) -T f 0 ) o You can use °C for ∆T o ∆T f = -K f m where m= molality and K= freezing point depression constant, which is different for each solvent Correcting for dissociating species o ∆T f = -i K f m Osmotic pressure o See c o The height of the column will go up, increasing pressure. o P=gdh o π is in pascals o π = gdh o π = osmotic pressure o = π cRT o The hotter it is, the higher the molecules will go. o = π i CRT where C is concentration in molarity o Can also be written o = πV inRT
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General Chemistry Lecture 102a
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Unformatted text preview: In class notes for October 26, 2007 o Make sure T is in K o R= 0.08206 Isotonic solution (isoosmotic) o There is a concentrated solution in the cell o If pure water were to be around it, the cell will blow up o If you put it in salt water, (brine is concentrated salt water, it is hypertonic, meaning more concentrated than then cell) the cell will shrivel up o Water is hypotonic ,meaning it is less concentrated than the solution in the cell Osmotic pressure is used for Molecular weight determination o 7.86 mg of B-carotene are dissolved in 10.0mL chloroform to give an osmotic pressure of 26.57 mm Hg at 25C. What is the molecular weight? o = cRT o C= RT o See D o o...
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This note was uploaded on 02/22/2009 for the course CHEM 102a taught by Professor Hanusa during the Fall '06 term at Vanderbilt.

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In class notes for October 26, 2007 - In class notes for...

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