Find out what affect the change of concentration in the sucrose solution

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Find out what affect the change of concentration in the sucrose solution

has on the mass of a potato chip.

Introduction

In this experiment I will be taking five similar potato chips and

putting them into different sucrose solutions (each one with a

different concentration) and observing the effect that each

concentration has on the size of the potato chip.

Aim

I am doing this investigation in an endeavour to find out what affect

the change of concentration in the sucrose solution has on the mass of

a potato chip.

Background information

Ø Osmosis is the movement of water molecules across a partially

permeable membrane from an area with high concentration to an area

with low concentration

Ø The opposite of osmosis is active uptake, this is when water moves

from an area with a low concentration to an area with low

concentration. An example of this would be a root hair cell getting

water from its surroundings.

Ø Partially permeable membranes have holes in them. These holes are

the size of just one water molecule.

Ø Water can pass through the membrane in both directions although if

there is a higher concentration of water in the solution rather than

the potato chip, the potato chip will receive water molecules and will

increase in size.

Ø Some membranes in plant and animal cells allow only certain

particles to pass through them. They are partially (or selectively)

permeable.

Prediction

I predict that as the concentration of the sucrose solution decreases

the mass of the potato chip will increase. I think this because a

lower sucrose content would mean a higher water content and therefor

as osmosis takes place the water in the solution will move from the

solution to the potato chip and as a result increasing the mass of the

potato chip.

I also predict that the concentration of the solution and the mass of

the potato chip will be directly proportional to each other.

Variables

In this investigation I will change the concentration of the solution

and I will be keeping the size of the potato and the temperature of

the solution the same.

Equipment

Below is the apparatus that I will be using for my investigation.

Ø Stop watch

Ø Cutting tile

Ø Small knife

Ø Measuring cylinder

Ø Distilled water

Ø sucrose

Ø Potatoes

Ø Weighing scale

Ø Potato cutter

Ø Cling film

Ø Ruler

Method

Ø Firstly I will cut five pieces of potato.

Ø Then I will peal the potatoes with the knife.

Ø After this I will measure and weigh them to ensure that they are

equal.

Ø Subsequently I will put 40ml of my solution in each of the testubes.

Test tube one will have 10ml of distilled water and 30ml of sucrose.

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