E       Types of Diagram Set-ups in diffusion problems  |
                            -- The ANSWERS
          You will shortly learn how to do diffusion problems.  There are only two major formats to
          the way diagrams must be set up.  Then you label concentrations on the diagrams.

1               A tank if partitioned by a  S E M I   (differentially or selectively) permeable membrane
(Alternatively [TR #6]  )  Different molecules (shown by different colored dots), often
at differing concentrations, are then placed on the two sides of the membrane.   In the two sets of diagrams above, the containers (boxes or beakers) appear to have covers.  This is not necessary.  At times, the contains may have open tops.

2               A pouch made from  S E M I   (Bio H    D I F F E R E N T I A L L Y)   permeable membrane is placed in a container filled with a stated fluid.  This pouch material is a
special plastic that has tiny holes in it.  You can't see the holes, but some molecules
are  S M A L L   in size and can fit through the holes.

 

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