Osmosis Experiment

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

diffe...

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... differenciates between the two), age of vegatable (potatoes could be

used that are different ages, such as 2months old, 4months, 6months,

8months, 10months and a year old to see how the rate of osmosis

changes as the age of the potato increases) or the length of time that

the potato is left in the same concentration of solution ( example:

10mins, 20mins, 30mins, 40mins, 50mins and an hour) *this was what we

used for our preliminary work which we discovered the rate of osmosis

becomes greater but directly proportionally until eventually an

equilibriam is reached. Or the size/ surface area of the potato could

be altered in the same concentration of sucrose solution. ( ie,

lengths of 1cm, 1.5cm, 2cm, 2.5cm and 3cm, or wieghts of 1g, 1.5g, 2g,

2.5g and 3g to see how osmosis differs as the length/mass of potato

increases.