Essay PreviewMore ↓
Osmosis is the diffusion of water from a lower concentration of solute
to a higher concentration of solute through a partially permeable
membrane. This lets smaller molecules such as water, pass through but
does not allow bigger molecules through. The molecules continue to
diffuse until they reach a balanced state, where no area has a higher
or lower concentration than any other.
In a high concentration of water the amount of sugar solution is low.
This is called a weak/dilute solution. In a weak concentration of
water the amount of sugar solution is high. This is called a
When a semi-permeable membrane divides two solutions, the water will
move from the area of high concentration to the area of low
concentration, until both sides are equal.
To find out how much sugar concentration there is in a cell of a
potato. This means I will put the potato cylinders in different
solutions of different concentrations.
There are also other factors involved, these are:
· Temperature of water
· Size of potato cylinder
· Mass of potato cylinder
· Volume of solution potato cylinder is in
· Type of potato
· Time left in solution
If this experiment isn’t a fair test, we will be collecting the wrong
results, which can lead us to the wrong conclusions. To conduct a fair
test I will ensure that the experiment is carried out at room
temperature. The size of the potato is an important factor, as the
amount of weight lost or gained will alter. Also the potato cylinders
will be weighed before and after the experiment to see if osmosis has
taken place. The type of potato I will use will stay the same as
different potatoes may absorb at different rates.
A range of sugar solutions will be arranged with concentrations……………..
Sections of potato will be cut with a scalpel and measured with a
ruler. This has to be done carefully as the difference of surface area
may allow more or less osmosis to occur. The mass of each cylinder
will be weighed to ensure consistency. I will do each experiment three
times so that I can take an average for each sugar solution. By doing
this I will receive more accurate results and therefore draw up a more
accurate conclusion. I will also use 20 ml of each solution and of
tap water. The potato cylinders will then be left for 15 minutes. When
the cylinders are removed I will clean them with a paper towel, to
remove excess moisture, and then re-weigh them.
For this investigation, I think the lower the concentration of the
How to Cite this Page
"Find out the concentration of the cell contents of a potato." 123HelpMe.com. 28 Mar 2020
Need Writing Help?
Get feedback on grammar, clarity, concision and logic instantly.Check your paper »
- The Concentration of the Contents of a Potato Cell Plan I am going to use a range of concentrations to enable me to get a good result. I will do this experiment twice to get an accurate answer. Prediction The passing through a semi-permeable membrane of high concentration and low concentration to an equal concentration is called Osmoses. Because of the balancing out of weight I predict that the weighted of the potato in the lower concentrations will increase and the weight of the potato in the higher concentration will decrease.... [tags: Papers]
383 words (1.1 pages)
- An investigation of the glucose concentration of the cell sap in potato cells In this experiment I intend to investigate the effects of osmosis on potato cells. Specifically, I intend to use my knowledge of osmosis to investigate the glucose concentration of the cell sap in potato cells. Osmosis is a method by which water levels on either side of a semi permeable membrane may balance themselves. It occurs between regions of high water concentration and low water concentration. As it is a special method of diffusion exclusive to water, it also allows dilute and concentrated solutions to balance their strengths.... [tags: GCSE Biology Osmosis Coursework]
3449 words (9.9 pages)
- Which Sugar Concentration Osmosis Best Takes Place on a Potato Chip I am going to conduct an investigation to find out at which sugar concentration osmosis best takes place on a potato chip. Osmosis is defined as the net movement of water or any other solution with molecules from a region in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules such as water through but does not allow bigger molecules to pass through.... [tags: Papers]
1630 words (4.7 pages)
- How Osmosis affects Potato chips in Different Concentrations Background: Osmosis is the movement of water molecules across a partially permeable membrane from a region high water concentration to low water concentration. A partially permeable membrane is a membrane with tiny holes in so small that only water molecules can pass through. When you place a potato chip in a salt or sugar solution, then if the potato has higher water potential some of the water will diffuse into the Sal solution which will cause the chip to lose weight.... [tags: Papers]
2689 words (7.7 pages)
- Osmosis in Potato Cells In this investigation I will be investigating the amount of osmosis in potato cells and whether osmosis and potato mass changes in different strengths of sugar solutions. I will do this by putting a constant amount of potato in solutions with steadily increasing sugar contents. Preliminary: I decided to under take a preliminary experiment to find out whether there are any problems or hitches that would have to be sorted out before the real experiment.... [tags: Papers]
1773 words (5.1 pages)
- Determining the Water Potential of a Potato Chip Aim: To determine the water potential of a potato chip Background knowledge What is water potential. Water potential is the measure of the tendency of water to move from one place to another. Like the movement of water from potato chip to surrounding solution or vice versa. Water always moves from an area of high water potential to a region of lower water potential. The addition of solutes decreases water potential making it more negative.... [tags: Biology Lab Report]
2630 words (7.5 pages)
- Isobel Lu Goss Honors Biology 12/18/15 Rate of Enzymatic Activity With Different Amounts of Substrate Concentration Background: “Enzymes are very efficient catalysts for biochemical reactions. They speed up reactions by providing an alternative reaction pathway of lower activation energy.” (http://www.rsc.org/Education/Teachers/Resources/cfb/enzymes.htm) Enzymes function by joining with substrate(s) on their active sites to form an enzyme-substrate complex, where they then break large molecules into smaller pieces or bind two molecules together.... [tags: Enzyme, Oxygen, Gas, Catalysis]
1730 words (4.9 pages)
- Investigation of Water Potential of Potato Tuber Cells Introduction This experiment is to find out the water potential of potato cells. Water potential is the ability of water to move and is represented by the Greek letter Ïˆ (pronounced Â“syÂ”). It tells us which way water will move and how fast. Water potential is always measured as a negative number; this is because the water potential of pure water at atmospheric pressure is zero therefore the stronger a solution is the more negative the number.... [tags: Biology Lab Report]
392 words (1.1 pages)
- Rate of Osmosis Between Potato Cylinders and Sucrose Solution Introduction I am doing an investigation, to find out on how varying one factor effects the rate of osmosis between potato cylinders and Sucrose solution. Osmosis is the diffusion of solvent (usually water) particles through a selectively permeable membrane from a region of high solvent concentration to a region of lower solvent concentration. Examples of Selectively permeable membranes are (a) the cell membrane, and (b) visking (dialysis) tubing.... [tags: Papers]
2115 words (6 pages)
- How the Concentration of Salt Solution Affects Osmosis in Potatoes Osmosis is movement of water through a selectively permeable membrane, from where there is a higher water concentration (or water potential) to where the water concentration is lower. In this piece of coursework I will answer the question, ‘How does the concentration of salt solution affect osmosis in potatoes?’. If you put a piece of potato into pure water, the water concentration is obviously higher outside the potato.... [tags: Papers]
806 words (2.3 pages)
- Air Bags Can Kill
- Find out what affect the change of concentration in the sucrose solution
- Find the concentration of sucrose in a potato cell - Plan
- African Americans role of Television
- Investigate the Rate of Osmosis in Different Vegetables (Carrot, Potato, Swede, Parsnip and Sweet Potato)
- A Slight Misunderstanding
be. This is because the water molecules will pass from a high
concentration (the water) to a low concentration (the potato
cylinder). This means that the potato in higher water concentrations
will have a larger mass than in higher sugar concentrations.
· Sugar solutions x5- 0%, 1%, 2%, 3% and 4%
· Tap water
· Cork borer
· Measuring cylinder
· Beaker x5
· Digital scales
1. Bore a hole through an average sized potato.
2. Using a scalpel and ruler I cut the potato into 5 equal pieces
measuring 2cm long.
3. Using a measuring cylinder, I measured out 100ml of water and put
it into each of the beakers.
4. I then weighed the sugar content needed by using digital scales.
This varied starting with 1g for 1% of sugar, then 2 grams for 2% of
sugar etc. These weights were then recorded.
5. I put each potato cylinder into the different beakers containing
the sugar solution. These were labeled so as to not get confused.
6. We covered the tops of the beakers with clingfilm so that oxygen
would not interfere with the experiment.
7. After 48 hours, I drained out the solutions and placed all the
potato cylinders in the order they were in the beakers, so not to
8. I dried each potato and placed it on the scales to be weighed.
9. Each was measured accurately and recorded.
10. The potato cylinders were weighed twice as to gain an average for
Results and Conclusion
% of Sugar Volume of Sugar weight Mass before Mass after Change in mass
Solution water (g) (g) mass (g)
0% 100ml 0g 5.12g 3.32g 1.80g
1% 100ml 1g 4.92g 3.27g 1.65g
2% 100ml 2g 5.23g 2.94g 2.29g
3% 100ml 3g 5.14g 2.50g 2.64g
45 100ml 4g 5.12g 2.48g 2.64g
My graph shows that the mass of the potato cylinders before the
experiment are roughly more or less the same, whereas as after the
experiment, their mass decreases more as a result of which solution it
was in, e.g. - high sugar solution= decrease in mass.
My results show that the potato cells increase in mass solutions in
high concentration and decrease in mass in solutions in low
concentration. When the concentration reaches above 3%, there appears
to be no further mass loss, this is because the cell is fully
plasmolysed. This is called the isotonic point, when the potato is
neither increasing nor decreasing in mass. This is when the potato
cannot expand and take in any more water.
The graph shows that there is an obvious decrease in mass during the
experiment, which proves my hypothesis as being correct as the higher
the sugar concentration the more mass lost.
On my graph I have marked the point where the graph line crosses the
place on the axis where the potato neither loses nor gains mass. This
happens when the concentration of the sugar solution is 3%, so
therefore the content of the potato is 3%.
In my opinion the experiment went well. I gathered a sufficient
quantity of results that allowed me to create an informative graph.
The time used for the experiment was a good choice as it gave enough
time for osmosis to occur. The amount of concentrations was about
right, but if I were to repeat the experiment I would maybe use higher
In my opinion the cutting of the potatoes was the hardest part as
although I was only recording the mass for my results, it could have
affected the surface area and therefore the general rate of osmosis.
Through my findings I did not find any anomalies. The only possible
incorrect things could have been that on removing the potatoes from
the beakers, one could have been more dried more thoroughly than the
others and so would have had excess water, this would add to the mass.
If the experiment was repeated I would find another way to dry off the
potatoes that would ensure they were dried the same way for the same
amount of time.
To extend this experiment I could by looking at the potato cylinders
through a microscope, this would enable me to see the cells in greater
detail and draw some more observational drawings.
However I thought the experiment went very well, and I was pleased
that the results backed up my initial prediction.