• 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

# An Investigation to Find the Effect of Changing the Sucrose Concentration on Osmosis in Potatoes.

Extracts from this document...

Introduction

An Investigation to Find the Effect of Changing the Sucrose Concentration on Osmosis in Potatoes Planning The aim of this investigation is to find out how the rate of osmosis in potatoes is affected by changing the concentration of the sucrose solution in which the potatoes are left overnight. This is how we did it : Method 1. Collect all apparatus necessary ready for use 2. Use the cork borer to gain four equal sized pieces of potato 3. Use a ruler and a scalpel to make sure the potato pieces are exactly equal. Weigh and record their masses 4. Fill four test tubes with the different levels of concentrated solution and label carefully 5. Add one piece of potato to each test tube 6. Leave for 24 hours 7. Gently pat dry, then weigh 8. Record results 9. Calculate mass gained/lost 10. Redo experiment another 2 times. Nb It is very important to try and be accurate when collecting results, so the results reflect what they are expected to. For these reasons, we used rulers to measure the length and width of the chips, and why we weighed the chips with a digital scale, which measured up to two decimal places. Valid Evidence To ensure that a valid test is carried out in this test, so that all the values are accurate, there are a few things you need to take into consideration. ...read more.

Middle

Here are the results we gained: Potato Solution 30% 15% 1% Water Mass Before 3.37g 3.47g 3.23g 3.55g Mass After 2.16g 2.67g 3.38g 3.74g Mass Gained -1.21g -0.71g 0.15g 0.19g In this experiment, the cork borer was 1.3 cm in diameter, which means that all the potato chips were 1.3 cm wide. These results show me roughly what the results I gained for the real experiment show. This is basically that the potato chips in the lower percent concentrations gained more in mass than those in the higher concentrated solutions. We can use these results to further back up our conclusion. Observations Below are the real results we got when we were doing the practical three times. You can see from the table that we used water, and 5%, 10%, 15% and 20% solutions in this experiment. Potato Solution 0% 5% 10% 15% 20% Mass Before (g) 2.93g 2.93g 2.92g 3.08g 2.82g Mass After (g) 3.14g 3.09g 3.03g 3.09g 2.83g Mass Change (g) 0.21g 0.16g 0.11g 0.01g 0.0g % Change 7.17% 5.46% 3.77% 0.32% 0% Average % Change +4.44% +3.03% +0.92% -1.09% -2.16% Turgidity Turgid Turgid Floppy Soft Floppy Mass Before (g) 2.88g 2.84g 3.0g 3.07g 2.90g Mass After (g) 2.96g 2.85g 2.97g 2.98g 2.75g Mass Change (g) ...read more.

Conclusion

Reliability I do not think that our results are very reliable, as the lines of best fit on my graph are not that close together. If my results were very accurate then the lines of best fit on my graph would be very close together, and there are not, though the second and third lines of best fit are closer together than the third is. Overall, I don't think that these results are very accurate. Although I do not think my results are very reliable, I do think that they are good enough to construct a firm conclusion, as they show roughly what I expected them to. Also, I have three sets of results, which all roughly resemble each other, so this must suggest that I did something right and that they are not totally wrong. Further Work If I had more time, as a way of extending this work, I could try to do an alternative experiment that might allow me to narrow down where the isotonic solution is in different vegetables. One of the vegetables I could use to illustrate this could be something like a swede or a parsnip, as they both have similar properties to that that a potato has. I could also use this to see if they absorbed as well as a potato and if osmosis would still work in these cases. ...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. ## Investigating the effect of Sucrose Concentration on the Rate of Osmosis in Potato Chips.

5 star(s)

Water will move into plant cells like those in the potato chips because: * The cell membrane of the plant cell acts as a partially permeable membrane. * The cell sap inside the vacuole is a strong solution. * Water advances into the plant cell by osmosis.

2. ## Investigation into the Rate of Osmosis in Potatoes and to find out the Sucrose ...

Plant cells do not burst in pure water, though, because they have a cell wall that is fully permeable so osmosis does not take place across it. It is bypassed and osmosis takes place between the cell membrane in the same way as an animal cell, but with the resistance

1. ## Diffusion in Agar Block

Since nine readings were taken we can say the results are consistent but there were still a few unavoidable errors caused by the equipment used in this experiment. For example a +/-0.05 error while measuring 3cm would give a 1.67% error which is a significant error.

2. ## Experiment investigating concentration of sucrose solution and potatoes

4.62 4.32 4.67 4.82 4.87 4.21 Weight of the potato after the experiment (grams) 4.95 4.53 4.61 4.94 4.76 3.89 Total change in weight due to experiment (grams) +0.33 +0.21 -0.02 +0.03 -0.11 -0.32 Percentage loss (%) 7 5 -4 0.6 -2 -8 Real experiment 3: New Dilutions: (all dilutions made for 25ml)

1. ## Investigation Into How Osmosis In Potatoes Is Affected By Solution Concentration.

a solution with higher amounts of water in it-the higher the rate of osmosis. I think this will occur because a higher water concentration has a higher number of water particles in it, thus there will be more movement of water particles and therefore a faster rate of osmosis.

2. ## An investigation into the effect of Sucrose concentration on osmosis

* 1 large potato - for the potato cylinders. * 10 test tubes - 5 to hold each concentration, and 5 for the repeat experiment. * 1 ruler - to measure the length of the potato cylinders to ensure they are all 3cm.

1. ## An Investigation Into the Effect of Sucrose Concentration On Osmosis (Using Potatoes).

This is how the experiment will be carried out: *ALWAYS BORE THE POTATO ONTO A WHITE TILE* 1) Measure 30cm of each sucrose concentration (in this case 0m, 0.1m, 0.2m, 0.3m 0.4m and 0.5m). Place each different one in a different cup.

2. ## Investigating the effect of changing the concentration of a glucose solution on osmosis in ...

The cells have a 'partially permeable membrane. The partially permeable membranes have small holes in, and only allow water molecules to pass through and not the glucose molecules because they are too large to pass through. When the cell fills with water, it becomes turgid and expands, and when the water moves out of the cell, it becomes flaccid, and returns to its normal shape.

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