lab osmosis and diffusion AMC

Topics: Solution, Chemistry, Potato Pages: 8 (2248 words) Published: November 10, 2014
Arianna
 Montoya

Osmosis
 and
 Diffusion
 Lab
 Report
Background
 Information:

 Diffusion
 involves
 the
 movement
 of
 solute
 particles
 across
 a
 selectively
 permeable
 
membrane
 from
 higher
 to
 lower
 concentrations.
 A
 selectively
 permeable
 membrane
 
allows
 only
 some
 thing
 to
 go
 through.
 Water
 and
 oxygen
 are
 examples
 of
 molecules
 
that
 are
 able
 to
 go
 through
 the
 membrane
 by
 diffusion.
 The
 net
 movement
 of
 these
 
particles
 happens
 down
 the
 concentration
 membrane.
 Both
 diffusion
 and
 osmosis
 
are
 passive
 processes
 meaning
 no
 energy
 in
 ATP
 is
 needed.
 When
 molecules
 are
 
even
 throughout
 the
 space
 its
 called
 equilibrium.

 
Osmosis
 is
 the
 diffusion
 of
 water
 across
 the
 selectively
 permeable
 membrane.
 Water
 
will
 move
 in
 the
 direction
 where
 there
 is
 a
 higher
 concentration
 of
 solute
 (
 meaning,
 
a
 lower
 concentration
 of
 water)
 .
 In
 osmosis
 different
 concentrations
 of
 solutes
 are
 
compared.
 A
 solution
 that
 has
 equal
 concentrations
 of
 solute
 is
 isotonic.
 A
 solution
 
with
 a
 higher
 concentration
 of
 solutes
 is
 hypertonic
 and
 one
 with
 less
 concentration
 
of
 solutes
 is
 hypotonic.
 “The
 term
 osmolarity
 is
 used
 to
 describe
 the
 number
 of
 
solute
 particles
 in
 a
 volume
 of
 Gluid.
 Osmoles
 are
 used
 to
 describe
 the
 concentration
 
in
 terms
 of
 number
 of
 particles.”
 It
 is
 deGined
 as
 the
 number
 of
 osmoles
 of
 solute
 per
 
liter
 of
 solution.

Introduction:

 Experiment
 A:
o Research
 Question:
 How
 does
 the
 amount
 of
 solute
 in
 a
 solution
 affect
 a
 
potato
 tuber
 tissues
 weight?
o Hypothesis:
 If
 the
 solute
 concentration
 in
 the
 solution
 is
 high
 ,
 then
 the
 
potato
 tuber
 tissue
 will
 lose
 weight
 because
 they
 will
 lose
 water
 through
 
osmosis.
 
o Independent
 Variable:
 Salt
 in
 the
 solutions
o Dependent
 Variable:
 
 Weight
 of
 the
 potato
 tuber
 
o Control:
 
 Beaker
 with
 distilled
 water,
 size
 of
 the
 potatoes
Experiment
 B:

o Research
 Question:
 How
 to
 bigger
 molecules
 react
 to
 a
 selectively
 permeable
 
membrane?
o Hypothesis:
 If
 starch
 diffuses
 through
 the
 semi-­‐permeable
 membrane,
 to
 an
 
area
 of
 lower
 concentration,
 then
 the
 substance
 will
 change
 color
 as
 an
 
indicator.
 From
 a
 yellowish
 substance
 to
 a
 more
 transparent
 one.
o Independent
 Variable:

Bibliography: Bowen, R. "Osmosis." Osmosis. N.p., 30 Jan. 2010. Web. Oct. 2014. www.vivo.colostate.edu/hbooks/pathphys/misc_topics/osmosis.html>.
Helmenstine, Anne Marle. "What Are Osmolarity and Osmolality?" About. N.p., n.d.
Web. Oct. 2014. .
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