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Osmosis Experiment Essay

3904 words - 16 pages

Osmosis Experiment
Experiment to investigate how equal masses of potato are effected in
different concentrations of 1molar sucrose soloution.

Aim:

To investigate if osmosis occurs in potatoes, and if so, how it
affects potatos of equal mass (2.5g) in different molar solutions of
sucrose and water.

Apparatus:

-Cutting tile which will be used to cut the potato on.
-Knife which will be used to peel the potato with and to cut to
correct mass.
-Burette which will be used to measure the solutions acurately.
-Distilled water to make up solutions as part of the experiment
sucrose to make up part of the experiment
-Potatoes to cut into equal mass and observe what happens to them when
left in differing concentrations of sucrose solution.
-Tissue paper which will be used to dry the potatoes after the
-Electronic Balance to weigh the potatoes acuratley. -Cork borer which
will be used to cut out potato cylinders. -Boiling tubes to put 20ml
of differing solutions into.

Variables:

-Concentration of solute. -Size or surface area of vegatable. -Type of
vegatable. -Age of vegatable. -Length of time vegatable is left in
solution for.

*The variable used in this experiment has been highlighted in red.

Planning:

Before the planning the experiment, some will Background Information
will be needed to find out about osmosis, and other matters related to
osmosis, so that a prediction can be made. And to construct a way to
make this a fair investigation. Having already done preliminary work
on the rate of osmosis on potatoes of the same length when left for
differing periods of time this investigation can be seen as a follow
up to the previous one. Whereas in the previous experiment the
variable was time, this experiment will be kept similar however the
potatoes will be kept for the same amount of time but in differing
concentrations of sucrose solution. Also, the potatoes have been
changed from length to mass as mass will provide a more reliable set
of results to analyse.

Background Information:

Osmosis, the net or overall movement of solvent molecules (often water)
from a region where they are at a higher concentration to an area
where they are at a lower concentration through a partially permeable
membrane (sometimes called a selectively permeable or semi-permeable
membrane).

Substances often move from an area of higher concentration to an area
of lower concentration by diffusion, the result of random particle
movement.

In osmosis, two solutions are separated by a membrane that will only
let the solvent particles pass through. This means that the solvent
continues to move freely along a concentration gradient. However, the
other substance involved-the solute-cannot move freely because the
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