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Please post any questions relating to material that was covered after Thanksgiving as comments on this message.
Filtration, Membrane Separations, Chromatography & Electrophoresis
Filtration, Membrane Separations, Chromatography & Electrophoresis
posted by Dr. B at 8:29 PM
5 Comments:
The equation for I in your slides differs from the one in the book. Which should we use in the exam?
Book: I = i*Amem/Ncellpairs
Slides: I = i*Amem*Ncellpairs
Karen:
This point is complicated by the definition of Amem. In my eqn, Amem was the membrane area of each cell so you have to multiply by the number of cells. I=i*Amem*Ncellpairs
The book used Amem for the total membrane area of ALL cell pairs. Their eqn should be I=i*Amem. I cannot find the eqn you gave in the textbook. Tell me where it is and I will take another look.
I was looking at Midterm 2, and got 4 points taken off on my graph for Pmin. But on your graph, it's the exact same spot. I've seen this on at least one other exam, so I'm guessing this might have been a common thing. If you can recall this as a common error, what were those 4 points taken off for?
oops i am reposting this on the correct spot i didn't see it below.
duck tail 11:21 PM:
It is hard to say for sure, but MANY people located Pmin by drawing line SRN correctly but then drawing a line through F and the plait point. This is not correct. Pmin lies on line SRN where the tie line crosses it. In this case because we are on the extract side of hte plait point, we wnat the tie line that crosses closes to S. It turns out that the top tie-line is the winner.
I would have to look at your test to say exactly how I came up with -4 points.
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