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Osmosis required practical
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Created by
Violet Walsh
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Cards (17)
Purpose is to explore what happens to
chipped potatoes
in different
concentrations
of
sodium chloride
solutions
Prep:
label
the boiling tubes with the concentration of
sodium chloride
you will use.
Prep: measure out
20
cm3
of each
sodium chloride
you will use and pour into appropriately
labelled
tubes.
Prep:
Dry potato chips
on paper
towe
but don’t
sqeeze
them.
Experiment: Weigh the
chips
using a
balance
and record
masses
( it is important to know
EXACTLY
which
chip
went into each
tube
)
Experiment: the
solution
should completely
cover
the
chips
Experiment: leave for at least an
hour
(
ideally
overnight)
Experiment: Remove chips
one
at
a
time
and
dry
on paper towel
experiment:
Reweigh
the chips and
record
the results in the table.
Change in mass =
End mass
-
Start mass
% Change = (
change
in
mass
?/
start mass
) X
100
Equipment:
0
(Distilled water),
0.1
,
0.2
,
0.3
,
0.4
and
0.5
M
sodium
chloride
solutions
Equipment:
6
Boiling
tubes
Equipment:
Paper
towel
Equipment:
cork
borer
cut potatoes
Equipment:
Top
pan
balance
( scale)
Equipment:
Pen
and
Paper