Since the potato placed in 0.1 M of glucose experienced a positive change in mass, it shows that potatoes have a low solute concentration. From our graph we can conclude potatoes have an osmotic potential of 0.2 M, which isotonic point of no net movement of water molecules across the potato cell’s membrane.
What solute is in potatoes?
Background – Molecules are constantly in motion as a result of a cell’s stored kinetic energy, which causes them to bump into each other and move in random new directions. Diffusion is the movement of molecules from an area of where there are many (high concentration) to an area where there are fewer (low concentration). 
When each side of a membrane has equal solute concentration, the solution is said to be isotonic and water molecules will be equally likely to move in both directions across the membrane. In the case of a hypertonic solution, there is more solute outside the cell than inside the cell. 
In this activity, we are going to explore osmosis by looking at a dataset produced with a classic classroom experiment. The experiment uses pieces of potato that are placed in six different solutions of water each with a different solute concentration.
- The solute is sucrose and the concentrations are measured in units of molarity.
- The solutions range from no solute to a high concentration of solute and are 0.0 (distilled water), 0.2, 0.4, 0.6, 0.8 and 1.0 molar sucrose.
- Pieces of potato are cut to similar sizes, weighed, and then placed in one of the six solutions overnight.
The next day, the potato pieces are removed from the solutions, blotted dry, and their final masses are recorded.
What is the salt concentration of a potato cell?
DISCUSSION – The overall trend showed the salt solution with higher concentration to experience a greater rate of osmosis resulting in a larger decrease in mass apart from the end of the individual graph, which would suggest a random error to have taken place.
- Both sets of data showed solutions with higher concentration is hypertonic compared to the potato cells meaning the water would travel to the solution because it contained more salt.
- Evidently, the rate of osmosis in solutions with less salt were of a lesser extent because the water from the potato cells were less attracted.
The distilled water was hypotonic compared to the potato cells that contain approximately 2% salt. Hence why both the individual and class data indicated a gain in the potato mass. These results were represented in the negative linear trend in the graph (Figure Three).
What is the concentration of sucrose in a potato cell?
Russet potatoes have a sucrose concentration of approximately.2mol/L. As they are placed in a more dilute solution, their mass increases. As the molarity of sucrose increases, the water diffuses out of the potatoes and their mass decreases.
How can you predict the concentration of sucrose solution in the potato cell?
Example three – A graph of change in mass (vertical axis) against concentration of sucrose (horizontal axis) has been plotted and the results are shown here. Where the line crosses the horizontal axis at 0% change in mass, the sucrose concentration is equal to the concentration of the contents of the potato cells. Therefore, the concentration of the water in the outer solution is equal to the concentration of the water in the cells. There is no net movement of water by osmosis. Question Describe and explain the relationship shown in the graph. At low concentrations of sucrose the percentage change in mass increases as water has moved into the potato cells by osmosis from a region of high water concentration in the solution to lower water concentration in the potato cells, causing the gain in mass.
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- Page 9 of 10
Are potatoes hypotonic or hypertonic?
Conclusion – As is can be seen from Table 6, there is generally a decrease in mass when a potato is placed in water containing NaCl (aq) solution. The potato sap has little solutes, and therefore it is hypotonic while the salt solution has more solutes.
- Therefore, it is hypertonic.
- Water molecules moved from a region of low concentration to a region of high concentration.
- The purpose of using five potato tissues is for the accuracy of the results obtained.
- The percentage change in mass calculated increased the increase in salt concentration.
- At 30 min, all of them showed a decrease in mass.
This is due tote fact that a lot of water is drawn from potato tissue to the salt solution. As the time increases, the cell is continually losing water; there is no general trend as in others it increases from 30 minutes to 60 minutes while in others it decreases.
- Near to the end of the experiment, the cell increased slightly in mass, though it is still lower than the initial value.
- This is because the solution is isotonic, that is, all solution s have attained the same concentration, and there is no net movement of water molecules from one solution to another.
Though there is no specific theoretical value about the mass of potato used, the general conclusion is of a decrease in mass as the cells are losing water by osmosis (Odom et al, 2017). Evaluation Abbildung in dieser Leseprobe nicht enthalten
Is a 0.1 salt solution hypertonic or hypotonic to the potato cell?
In the 0.0, 0.1, and 0.2 M of sucrose concentrations the final mass of the potato increased. Therefore H2O enters the potato cell because the solution is hypotonic.
What concentration of NaCl is isotonic to the potato cells?
In the osmosis potato lab experiment, 0.2 M solution concentration of NaCl showed to be isotonic. The 0.4 M solution concentrations of glucose and sucrose also showed to be isotonic.
How does salt concentration affect osmosis in a potato?
Reading Time: 2 minutes Ever cut up some apples or potato slices just to see them turn funky colors and not be as fresh as they could be? What can you do to protect these fruits and vegetables and keep this from happening? What will keep potatoes (or other veggies) fresher: soaking it in regular water or saltwater? This month, I’m going to explain this question by explaining the concept of osmosis.
Osmosis is a property of matter that deals with diffusion; a spreading out of particles from high concentration to low concentration. Basically, more stuff balances out with less stuff. Like spraying a bunch of perfume in one place, notice how it travels across the room? However, instead of stuff in the air, osmosis describes the motion of water going through something.
I’m going to give you the experiment, and then we’ll talk about how exactly this water motion occurs. Materials: A potato, salt, water (if you have distilled water, that kind is best), a couple of drinking glasses. Procedure:
Fill two glasses with water In one of the glasses add 2-3 tablespoons of salt, and stir it in Slice up a potato into French fry-like pieces Make your observations on these pieces: pay attention to color, how flexible it is, smell, etc. Take a guess about how you think these slices might change by putting them into the different types of water Dunk the pieces in the water, and then let them sit overnight in it Remove the pieces onto a plate and make your final observations
Explanation: You will notice some immediate differences in the potato slices. The color of the salted water one is dark brown; not a nice image of how you would like your potatoes preserved! The one in the regular water looks like a nice white freshly cut piece of potato.
Moving on to the flexible test, the regular water one again feels firm and crisp (try to break the piece, it snaps!). The saltwater potato is bendy and doesn’t snap at all. Osmosis is the key to understanding this issue. Osmosis is the diffusion of water across a semi-permeable membrane (yikes!) from an area of high concentration of water, to an area of low concentration.
Semi-permeable membrane : a layer that only certain things can go through. For example, parts of the potato that water can pass through. Salt is the key here. Water will move from an area of less salt to more salt (more water to less water), and so when the potato is placed in the saltwater, all the water that is inside the potato (yes, plants have a lot of water inside of them, that’s what gives a plant it’s structure) moves out by osmosis.
What type of cell is a potato?
The flesh of fruits and vegetables such as potatoes are made of parenchymal cells.
How does sugar concentration affect osmosis in a potato?
The potato tubes in higher concentration sugar solution will shrink because water leaves their cells due to osmosis.
What is the solute potential of the potato cubes?
So we are talking about the solute potential that how much solute is present in a potato cubed here. So the correct value for its approximately 13 right.13 bar is the solute potential here.
What happens to a potato in sucrose solution?
Results – The potato cylinders placed in pure water or weak sucrose solutions will gain mass/length as water will have moved from an area of high concentration (outside the potato cells) to an area of lower concentration (inside the potato cells). The potato cylinders placed in strong sucrose solutions will lose mass/length as water will have moved from an area of high concentration (inside the potato cells) to an area of lower concentration (outside the potato cells).
How does sucrose concentration affect osmosis in potato cells?
Effect Of Sucrose Hypothesis On The Concentration Of Osmosis However, if the concentration of the solution in the beaker is less than that of the potato (such as distilled water), then the mass of the potato will increase. So, as the concentration of sucrose increases the rate of osmosis increases.
What happens when you put a potato in sucrose solution?
The sucrose solution has a less percent of water than the potato does. So because of osmosis the water in the potato will leave to become equilibrium with the sucrose concentration. If the concentration of sucrose is low in the solution, then the potato’s mass will change less because it has more water than sucrose.
What is osmosis in potatoes?
Osmosis refers to the movement of water molecules across a membrane trying to achieve equilibrium. Because there are no salts in distilled water, there is a higher concentration of water molecules in the distilled water compared to inside the potato. Therefore water moves INTO the potato.
What happens to potato in water?
Osmosis, the process in which solvent molecules move from an area of lower solute concentration to an area of higher solute concentration, can easily be demonstrated with potato experiments. Potatoes are full of both water and starch, and will gain water when immersed in watery solutions.
What happens to a potato in salt water?
INSTRUCTIONS: – STEP 1: Peel and then cut your potato into four equal pieces about 4 inches long and 1 inch wide. 
STEP 2: Fill your glasses half way with distilled water, or regular water if no distilled is available. STEP 3: Now mix 3 tablespoons of salt into one of the glasses and stir. 
STEP 4: Place two pieces of potato into each glass and wait.
What happens to potato in sugar solution?
Results – The potato cylinders placed in pure water or weak sucrose solutions will gain mass/length as water will have moved from an area of high concentration (outside the potato cells) to an area of lower concentration (inside the potato cells). The potato cylinders placed in strong sucrose solutions will lose mass/length as water will have moved from an area of high concentration (inside the potato cells) to an area of lower concentration (outside the potato cells).