• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7
8. 8
8

# The Chips Problem

Extracts from this document...

Introduction

Rebecca Thomas The Chips Problem Aim: To investigate which salt water concentration causes the potato chips to neither swell nor shrink. Explanation of Aim: Osmosis is the movement of water from an area of high water potential to an area of low water potential, across a partially permeable membrane, until equilibrium is achieved. Equilibrium is the movement of water by osmosis, entering and leaving the cells at a constant rate. Osmosis: Partially Permeable Membrane Water Salt Solution High Water Potential Low Water Potential Water Particle Salt Particle If the potato chips are placed in a solution containing a higher concentration of free water particles outside the chip than there are inside the chip, then the water enters the chip by osmosis, causing it to swell and therefore become turgid. Turgidity is caused by water entering the cells at a faster rate than it leaves. This excess water in the vacuole causes a high internal pressure, instigating the chip to be well supported and strong, and to therefore grow in length. A Turgid cell: Cell Wall Cell Membrane Vacuole Nucleus High Water Potential When the potato chips are placed in a solution containing fewer free water particles outside the cells than in, water leaves the chips by osmosis. ...read more.

Middle

free water particles outside of the chip, which would then cause there to be a possible higher concentration of free water particles inside the chip, so water would move out by osmosis, when it should have moved in. The potatoes in these solutions would become flaccid and lose mass. * Shake each test tube so that the solutions are well mixed and all of the particles are able to surround the chip equally. * Once the test tubes have been shaken, start the stopwatch. * Allow the chips to remain in the solutions for twenty-four hours, as osmosis is slow because it does not require energy. * Replications of the concentrations will enable you to identify any anomalous results, and to then discard them. They also allow you to calculate a mean result, which is more reliable than one result. * Record your results in a results table and produce a graph that shows the percentage change in mass against the concentrations. Apparatus: Cork borer: 6mm diameter 18 Test tubes Blotting paper Top-pan balance Test tube racks Ruler Scalpel Stopwatch Two syringes Potato Fireproof mat Cling film Sellotape Forceps 10% salt solution Distilled water Two beakers Safety: Care should be taken when cutting the potato cylinders with a scalpel. ...read more.

Conclusion

To improve the experiment, I could improve the overall accuracy of how it was executed. For instance, I could ensure that any preparations are completed for the same lengths of time, for example, the cutting and weighing times. To improve reliability, I could replicate five times instead of three, which would mean that I could discard any anomalous results and calculate a more reliable mean result, which is better than just one result. For further work which would provide additional evidence to support my conclusion, I could investigate more accurate concentrations, such as 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2, 5.4, 5.6, 5.8 and 6% salt water concentrations, as I know that the most suitable concentration is around 5%. To extend my enquiry, I could investigate other variables that might affect the rate of osmosis, and therefore, the change in mass of the potato chips. For example, the surface area of the chips might have an affect, because the larger the surface area of the chip in proportion to its volume, the faster the rate of osmosis, as there would be a greater region for the water to enter or leave the potato chip cells, at a much faster rate. Also, we could investigate how the temperature affects the rate of osmosis. Perhaps if it is warmer, then osmosis will occur at a faster rate because the enzymes will have energy to move quickly. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Life Processes & Cells section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related GCSE Life Processes & Cells essays

1. ## Potato Chips

Repeat this method three times. To make the sugar solutions you dissolve the percentage of sugar you want in 100cm� of water. For example, to make a concentration of 30% you would dissolve 30grams of sugar in 100cm� of water. To make this accurate you should use a measuring cylinder to measure the water that goes into the beaker.

2. ## The Chip Problem

molar solution, * one beaker with 0.5 molar solution, * one beaker with 0.25 molar solution and * one with distilled water in it. Once they are set up I will put 2 slices of chip into each beaker, all of which will be the same length with and depth.

1. ## Looking at how concentration affects the movement of water particles through a partially permeable ...

3. A high respiratory rate. As a consequence of 3, any factor, which increases the rate of respiration, e.g. a higher temperature or increased concentration of oxygen, will increase the rate of active transport. Any factor reducing the rate of respiration or causing it to cease, e.g.

2. ## Investigation to compare the water potential between potato chips and carrot chips.

This process is called osmosis. The transport of water and other molecules across biological membranes is essential to many processes in living organisms. The energy which drives the process is usually discussed in terms of osmotic pressure. I found this information from: http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/diffus.html Preliminary Work Before carrying out my actual investigation I did some preliminary work with just potato chips.

1. ## The 'chip shop' problem

a ruler and a knife making sure that when I cut I did it at a ninety-degree angle. Once I have cut the cylinders I need to weigh them each separately using a top pan balance. Once that is completed, I was ready to place the chips into the test tubes.

2. ## Osmosis is defined as 'the movement of water molecules from an area of high ...

When the concentration gradient is lower in the potato, the water will transfer from the solution to the potato. And vice versa. In the distilled water, I believe that the water is more concentrated in the potato, and therefore the water should transfer from the water to the potato, making the potato bigger in size, and heavier in weight.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to
improve your own work