• 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 Concentration of a Potato Cell Sap

Extracts from this document...

Introduction

An Investigation to Find the Concentration of a Potato Cell Sap Definition Osmosis is the movement of water from a weaker/more dilute solution, to a stronger/more concentrated solution through a selectively permiable membrane. We desplayed what will happen using a model cell experiment in which we subsituted visking tubing bags for cells. We placed glucose in one cell and water in the other. We then placed the cell filled with glucose in a test tube filled with water and placed the cell filled with water in a test tube filled with glucose. The results of this experiment showed that the cell filled with water lost weight and the cell filled with glucose gained weight therefore prooving the definition. Prediction I predict from a preliminary experiment that the concentration of the cell sap is 0.3 Molar. In the preliminary experiment we prepared three concentrationss: 0 Molar, 0.5 Molar and 1 Molar, and three potato chips all the same length. ...read more.

Middle

To be accurate, we will record the mass change in percentage and to calculate this we will use the equation: %change = (change in mass/original mass) x 100 Apparatus Method We are going to use potatoes to conduct our experiment because they are still living and have cell membranes. We will use 0.2, 0.3, 0.4, 0.5 and 0.6 Molar solutions of distilled water and glucose. We will measure the different Molar concentrations out by using a pippette, a measuring tube and a beaker. We will use the distilled water to make sure that it is a fair test and that the only thing dissolved in the water is glucose. We will cut five potato chips to excatly the same length, measure and weigh them, and drop them into the solution at exactly the same time. After 30 minutes we will take out the chips, dry any excess liquid off them, and reweigh and measure them. Analysation and Conclusion First Experiment Results Mass/g Length/mm Solution/M Original New Change %Change Original New Change Texture 0.2 3.27 3.35 0.08 ...read more.

Conclusion

But, there is a pattern in the opposite direction going in an inversely proportional way which means that as the concentration of the solution increases, the percentage change in mass decreases. My graph shows that there was an overall decrease in mass during the experiment. Evaluation My results were quite accurate but it was hard because the Molar solutions were hard to measure out as they were so tiny also we did the two experiments on different days so the teperature in the lab could have changed which would mean that one of them would work faster than the other. We didn't have any anomalous results which was good. Next time I did this experiment, I would change the length of time the potato chips were in the solution - I would work quicker at the beginning of the lesson to try and give them about 45 minutes in the solution. The results we got were enough to support a firm conclusion because we did a wide range and then we did a very narrow range which was more accurate. ?? ?? ?? ?? Claire Auchivole 10T ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction 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 AS and A Level Exchange, Transport & Reproduction essays

1. ## Osmosis. Aim: To find the molarity of potato tubers cell sap. BIOLOGICAL ...

4 star(s)

A plant cell with the vacuole pushing out on the cell wall is said to be turgid and the vacuole is exerting pressure on the cell wall. Hypertonic Solution: Hypertonic solution is more concentrated than the cytoplasm and the cell sap of the vacuoles in the cell.

2. ## The Effect Of Temperature On The Permeability Of The Cell Membrane

3 star(s)

Within the phospholipid bi-layer there are proteins and these proteins consist of polypeptide chains. As temperature increases from 40-60 degrees Celsius the average absorbance increases and the molecules vibrate so energetically that these bonds break easily and produces holes within the cell wall and phospholipid bilayer.

1. ## &amp;quot;An investigation into the Respiration of Carbohydrate Substrates by Yeast.&amp;quot;

5 star(s)

This means the probability that these results are due to chance is more than 0.05 or 5%, therefore less than 95% due to the manipulation of the independent variable, and are not considered significant. Glucose v Starch Baker's. t-Test: Two-Sample Assuming Equal Variances Variable 1 Variable 2 Mean 103.6667 25.23077

2. ## Investigation on Osmosis using a potato.

But other than that, there were not any bigger matters to be cautious or concerned of. Fair test To make this a fair test the following will be applied: Fair testing should play a big part in this experiment. If this experiment is not a fair test, we will be

1. ## permeability of beetroot membranes

We separately weighed each of these groups on filter paper so before weighing them together we found the weights of each piece of filter paper then subtracted that from the weight of the filter paper and 4 disks of potato together to find the weight of the potato disks.

2. ## Design an experiment to investigate the effect of temperature on the movement of a ...

This is much more accurate than using my eyes to judge how much of the pigment has diffused into the water. Diagram Apparatus * 6 Test tubes * 180cm3 distilled water * 10cm3 syringe * 6 water baths at the temperatures of 25�C, 30�C, 40�C, 50�C, 60�C and 70�C *

1. ## Investigating the concentration of cell sap in potatoes

Each group had its own weight range. The first group of potato, weighed between 0.92g and 0.98g. The second group weighed between 1.19g and 1.32g. The third group weighed 1.45g and 1.49g. We poured 5ml of different concentrations of water and sugar over the potato. These concentrations were: * Distilled Water * 0.05 Molar of sugar *

2. ## Hypothesis: To investigate the effect of different concentrations of ethanol on the permeability of ...

From this experiment the cell membrane from the beetroot would show how much ethanol would affect itâs cell membrane and the level of damage at what concentration or ratio with distilled water. From the results it would give scientist predictions of the effect of ethanol on a persons stomach or digestive lining.

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