• 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

# Experiment to find out the changes of mass in potato chips due to osmosis.

Extracts from this document...

Introduction

Experiment to find out the changes of mass in potato chips due to osmosis. Aim: We have been asked to investigate the effect that osmosis has on potato chips. Prediction: I predict that the potato cylinder in the lowest sugar solution (water) will gain the most mass through osmosis, whereas the 80% sugar concentration will lose the most mass through osmosis. I predict this because I think that the potato chips will try to gain and lose water between the two sides of its cell wall in order to reach an equilibrium between them. Because the 80% sugar solution has a high amount of sugar molecules, which can not diffuse through the membrane, I think that the potato will lose water in order to make the solution on the outside of its membrane equal to the water concentration on the inside (thus losing mass). I also predict that the other concentrations (60%, 40%, and 20%) will lose mass, but in lower numbers compared to the 80% sugar solution (the lower the concentration, the higher the mass). However, since the distilled water carries no sugar molecules, I think that the potato chip will gain water to create a balance between the two sides of the cell wall, making it gain mass. Scientific background: Osmosis is the diffusion of water molecules through a selectively permeable membrane from a region of high water concentration to a region of low water concentration. ...read more.

Middle

6. We must keep the potatoes in their solutions for the same lengths of time. 7. We must use the same balance to measure all of the chips. 8. We must try to keep the chips in the same volumes of solution. 9. We must put all of the chips into their solutions at the same time. 10. We must be careful not to squeeze the chips when taking them out of their solutions. Reliability: To ensure reliability, I have used another group's results. Safety: > All of the test tubes will be kept in a test tube holder so that they won't drop over as easily. > All of the potatoes will be cut on a white tile to reduce the risk of anybody getting cut. > Be careful when carrying a knife around the laboratory. > Be careful when using the knife, as it could slip and injure you. > Wash your hands after the experiment. My results: Concentration. 80% 60% 40% 20% 0% Sugar/water volume (cm�) 15 15 15 15 15 Original potato chip length (cm) 4 4 4 4 4 New potato chip length (cm) 3.3 3.4 3.5 3.8 4.2 Difference +/- in length (cm) -0.7 -0.6 -0.5 -0.2 +0.2 Original potato chip mass (g) 0.15 0.2 0.19 0.21 0.19 New potato chip mass (g) 0.08 0.12 0.13 0.19 0.20 Difference +/- in mass. (g) -0.07 -0.08 -0.06 -0.02 +0.01 Flexibility. Very Flaccid More flaccid. ...read more.

Conclusion

However, since they lie close to the line of best fit, they show that the results we obtained were quite accurate. Looking at my graph to show the lengths of the potato chips, I can see 1 anomalous result. Likewise, this result lies close to the line of best fit, meaning that the results are quite accurate. Anomalous results could have occurred do to us not repeating results, which could have given us a better average, and thus produced a better graph. Another reason that anomalous results may have occurred is that there was a mistake while mixing the concentrations due to human error when pouring in solutions. Also, the potato chips may have been measured incorrectly, again due to human error. If I was to do this experiment again, there are a number of things that I would have done differently. For example, I would have used a potato borer to cut the potato to make sure that all of the chips were the same shape, and thus easier to cut into the lengths that we wanted. More variables could have been used to make the experiment more interesting and educational. Another experiment that we could do to test osmosis is to take some visking tubing, knot it and half fill with starch solution, half fill with glucose solution. Then put it in a test tube full of water. Leave this for a while, then test the water for starch using iodine solution and test inside the visking tubing for glucose using benedict's solution. ...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. ## Aim: To find out the effect of altering the concentration of sugar solution on ...

To overcome this problem I invested in a more sensitive balance which measured masses in grams and this gave us increased precision up to 0.01grams. What I also realised was that I had to be quick in getting the chip with appropriate dimensions and placing it in the test-tube as

2. ## How does the concentration of glucose mass affect the mass of potato sticks?

Once the potato sticks are all set up in their individual test tubes, they will need to be all kept in the same conditions. The test tubes will be kept away from the sun, to prevent the sun from evaporating the water from the test tube, which would hamper the investigation.

1. ## Potato Chips

Explanation of Method: I came up with this method from a previous experiment done in class. I am going to use potato chips as it is easier to cut potato chips from the potato rather than using a potato itself as it is hard to find five potatoes all the same size.

2. ## The aim of this experiment is to find out what effect altering the concentration ...

The water threshold is reached at 0.5M so there is no need to carry on with the experiment after this point. The drying of the chips may have affected the results because if there were excess fluids left on the chips and they weren't dried thoroughly with tissue paper, this

1. ## To find out which concentration of solution will produce the smallest change in mass ...

Once I have completed the weighing process I will measure 8ml of distilled water (which has a MOL dm� � of 0) with a measuring cylinder before I place it into a test tube. I will then put one of the sliced potatoes into the 8ml of distilled water and

2. ## The aim of this experiment is to find the concentration inside a potato chip. ...

0.87 0.13 2M A 1.00 0.87 0.13 2M B 1.00 0.84 0.16 2M C 1.00 0.83 0.17 These are the preliminary test results. These help because they give me a clearer idea of what to expect during the final experiments and they tell me if I need to change anything, and I do.

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