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Permeability Model
Lab Report
Problem: Is the plastic bag permeable to iodine? Hypothesis: This iodine will get into the bag of starch.
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Independent Variable: color of the iodine so lution
Dependent Variable: color of the starch solution Materials: one glass beaker, one plastic sandwich bag, one graduated cylinder,
iodine, starch, and a dropper
Procedure
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1.) Fill the plastic bag with 40 mL of starch so lution. Twist the top of the bag and
tie it.
2.) Observe and record the color of the starch in the before section of the data
table.
3.) Fi ll a beaker with 80 mL of water, an d add iodine to the water until the water
is a golden yellow color.
4.) Observe and recor d the color of the iodine so lution in the before section of
the data table.
5.) Place the plastic bag containing the starch solution into the beaker containi ng
the iodine solution.
Plastic baggie with sta r ch s o lution ---~,> c, /"',.
Beaker of iodine
6.) Leave over ni ght.
7.) Remove the plast ic bag from the beaker.
8.) Observe and record (in the after 24 hours section of the d ata table) the color
of the starch solution inside the plastic ba g.
9.) Observe and record (in the after 24 hours section of the data table) t he color
of the iodine solution inside the beaker.
10.) Clean up.
Plastic baggte
with
1.-t:1n:h s olution
Reaker of iodine solution.
EXPERIMENTAL DATA
Before After^24 hours
Color of Starch solution It^ w^ as^ a w hitish colo^ r.^ Da^ rk,^ pu^ rple, black color.
inside baf!
Color of Iodine solution A golden col or. A^ tra^ n^ sparen^ t^ cr^ eme
inside beaker col^ or^.
CONTROL DATA
Before After^24 hours
Color of starch solution Whi te Whi te
inside baf!
Color of H20 in beaker T^ rans^ par ent^ Tra^ nspa^ rent
Questions
1.) Wh at part of a cell does the plastic bag represent?
The pl astic bag repre sents the ce ll m embrane.
2.) What color was the starch at the sta rt of the experiment? At the start of the
experimen t, the star ch was white in color. 3.) Did the iodine move in to the bag? How do you know? Yes, the iodine moved
into the bag, because the starc h in the bag turned a purple color and the
iodine is pu rp le. 4.) Di d the sta rch move out of the bag? How do you know? No, the starch did
not move out of the bag, because the outside solution was not purple.
5.) Was the iodine in t he b eaker li ghter in co l or before or after the experiment?
The iodine in the beaker was li g hter in co lor after the experiment.
6.) Is the plastic bag permeable to iodine? How do you know? Yes, the pl astic
bag is permeable to iodine, because iodine got in with the starch and it
turne d purple.
7.) Is the plastic bag permeable to sta rch? How do you know? The plast ic bag is
not permeable to starch, because the so lution outside of the bag had n ot
turned purple so the starch stayed in the bag.
8.) At the start of the experim ent, was the iodine in hi gh or low concentration
o uts id e of the bag? At th e sta rt of the experiment, the iodine was in high
concentration outside of^ the^ bag. 9.) At the start of the experiment, was the iodine in high or low co ncentration
inside of the bag? At the s tar t of the experiment, the iodine was in low
concentration inside of the bag.
