• 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

# We are doing a science investigation on finding out the concentration of the sap inside potato cells.

Extracts from this document...

Introduction

Introduction We are doing a science investigation on finding out the concentration of the sap inside potato cells. Variables * The weight of the potato piece * The size of the potato piece * The concentration of the sugar solution after * The room temperature The variable that I am testing is the concentration of the potato piece, before and after the experiment. Pre-test I decided to do a pre-test so I could get an idea on what concentrations I could use for the investigation. I did one concentration, which was 0.75 molars. This concentration turned out to be far too high. When I did the pre-test I cut a piece of potato with a cork borer and then cut them into three slices each at 1cm long. We decided on three slices so we could have a more accurate result. I then weighed each piece and they all weighed 0.30grams. I recorded my results I accurately measured the concentration of the sugar solution, which was 0.75 molars. I got the concentration by putting 15mls of sugar solution and 5mls of water this made it so that there was 75% sugar solution in the beaker, which is 0.75 molars. ...read more.

Middle

� I then weighed all the pieces to make sure that they all weighed the same. Any pieces that weighed too much were carefully trimmed until they were the right weight (0.30grams). � The sugar solutions were all measured to be the same amount (20ml). � The five experiments were all conducted at the same time, for the same length of time. � This also ensured that the experiments were all carried out at the same temperature. Investigation I collected my equipment, which included: � A potato � A cork borer � A pair of scales � A scalpel � 1 molar sugar solution � A beaker � A 20ml-measuring cylinder � Water I then prepared my equipment by setting up the concentrations of the sugar solution with a 20ml-measuring cylinder. Firstly I got 10mls of sugar solution and 10mls of water for the 0.50molars. For the 0.40molars I needed 8mls of sugar solution and 12mls of water. For the 0.30molars I needed 6mls of sugar solution and 14mls of water. For the 0.20molars I needed 4mls of sugar solution and 16mls of water. For the 0.10molars I needed 2mls of sugar solution and 18mls of water. ...read more.

Conclusion

The results of my experiment are reliable because the line of best fit almost goes through all my results on my graph. The results all seem to give the right answer if you ignore the anomalous result. Strong sugar solutions draw the water out of the potato and weak solutions lose their water to it. To be on the safe side I think that the experiment should be repeated using more than the five sugar solutions that I used. The next experiment should also include sugar solutions outside and inside the scale that I used. This would include 0.0, 0.05, 0.15, 0.25, 0.35, 0.45, 0.55 and 0.6 molars as well as the strengths that I used in the first experiment. To get a greater accuracy in the next experiment, I think that more than three pieces of potato should be used in each beaker. I think that ten pieces of potato should be used in a larger beaker with a larger quantity of sugar solution. This should ensure that any anomalous results would not affect the average result to a great degree. To make my investigation more accurate I measured my solutions in a 20ml-measuring cylinder with my head level with it so I could get a clearer reading and I would get the right amount I wanted. ...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. ## The concentration of the sap inside potato cells.

I think it will stay the same about 0.20-0.30molars because they are the two concentrations that aren't too high or too low. 0.50 is far too high and I know that it will decrease weight far too much. I think the potato slice will be firmer because the water in

2. ## Find the concentration of Potato Cell Sap.

At 0.2 M Sucrose, there is no change in length of potato and at 0.3, 0.5 and 0.5 m Sucrose, the potato decreases in size, with 0.5 becoming the smallest. The line of best fit on the graph is straight, indicating that there is a directly proportional relationship between the

1. ## Osmosis investigation

At the 0.4 Molar solution, there was 12ml3 of sucrose solution and 18ml3 of water so there was a dramatically smaller mass increase, only 1.04%, this shows that equilibrium was nearly reached, or an isotonic. This makes sense, as there is only a 6ml3 difference between the two solutions the

2. ## What is the concentration of the cell sap in the vacuoles of potato cells?

that the potato cylinders are left in the concentration should be the same. Additionally, the temperature of the room and hence the concentration must be kept the same, as variations will affect the results. I will repeat the experiment three times at each concentration and take an average of the results.

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

My theory in this experiment is that, due to the difference in the water concentrations of the two substances, I believe that the weight of the potato will start decreasing when it is tested on 0.2 molar solutions of sucrose and greater.

2. ## Osmosis. To investigate which sucrose concentration is the same as the concentration of cell ...

it swell up due to the fact that its vacuoles are now full of water. On the other hand, if the potato is placed in a strong sugar solution the opposite will happen - the water will move out of the potato across a huge concentration gradient (because although there

1. ## The purpose of my investigation is to find out the concentration of the cell ...

As water passes out the vacuole begins to shrink. These cells are no longer firm; we say that they are flaccid. As more water leaves the cell the cytoplasm begins to peel away from the cell wall. These cells have now become plasmolysed.

2. ## The Concentration inside Potato Cells

* If the concentration of the sodium chloride solution is high and the concentration inside the potato cells is reasonably high then the amount of osmosis that occurs will be low. If both concentrations are low then the same will happen.

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