All of these factors will affect the experiment due to the nature of the potato cells, but the only variable I will be changing is the concentration of the glucose solution. The experiment was very successful in my opinion. Then the observation was recorded for the next 5 minutes. Water Potential measures the concentration of free water molecules. Fill a dialysis bag with 2mL of 1M sugar solution 4 Record the temperature of the cold water 5. In this case, factors that influence the activity of an enzyme are called modulators. Put one potato slice in the salt solution and other in the sugar solution.
Diffusion is movement of cells from a high concentration, to a low concentration. Planning ahead would assist me in finding out how to do what, when to do it etc. There will be 5 test tubes, 3 pieces of potato in each test tube. Among the major causes of high blood pressure, as research shows, is salt specifically sodium, an electrolyte compound found in salt. Moving on to the flexible test, the regular water one again feels firm and crisp try to break the piece, it snaps! Hypothesis; I predict that the potato slice in beaker C will gain the most increased mass than beaker B and C.
This is because water is at the lower is moving toward the area of higher concentration, which in this case is the potato. So for my actual investigation I have decided to keep them in for four days, this would give the potato tuber enough time to complete osmosis as best it can achieve; it would also give me a bigger range between each result recorded. The molecules will continue to diffuse until the area in which they are found reaches a state of equilibrium, meaning that the molecules are randomly distributed throughout an object, with no area having a higher or lower concentration than another. Four unknown solutions were given and labeled as followed: Solution A, Solution B, Solution C, and Solution D. When the potato tubers are put into a high concentrated glucose solution there are more water molecules in the potato cells then in the solution; therefore the water molecules move by osmosis from the potato into the highly concentrated solution.
As water enters the cell, it expands until it pushes up tight against the cell wall. Enzymes are catalysts, and almost always proteins, that speed up the rates of reactions by lowering the activation energy without being consumed in the reaction Helms, 1998. People who think they are active, by erratically exercising less than three times a week, for twenty minutes or less at a time, are actually classed as sedentary, as is someone who sits at a desk job all day, only to unwind in front of the television all night — mindlessly devouring chips and drinking coke. When using the scales, we will make sure that the scale is reading zero before we put the potato pieces on it. For example, on the 1st experiment at 2 and 4 concentrations the mass of the potato goes up and the same happens on the 2nd experiment at the 6% concentration.
This means that the mass of the potato tuber will decrease, and its appearance will be flaccid. This should lead me to good results at the end of the experiment. Interpreting Data — Evaluating Evidence I believe that the experiment was successful as the results were as expected and were all in a similar range of one another; from looking at my graphs I can see that changing the concentration of the glucose solution affects the potato in differing ways according to the strength of the solution. This leaves the cell flaccid due to the process of plasmolysis. This shows that my results were accurate, which means that it is reasonable to draw a conclusion based on these results. For example, when someone in a room passes gas, the odor will eventually spread out among the room until it has reached equilibrium with the air in the room. Movement within the cell occurs by diffusion.
Hypothesis Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane. We were able to experiment and discover that the potato slices immersed in the lower glucose solutions, yielded to a higher mass than the ones immersed in the higher glucose solution due to the particles moving from an area of higher concentration to a lower one. Water goes in and out of the cell at an equal rate. Also to help aid accuracy I will repeat the experiment twice, totalling 3 results for each solution. I think I took enough results for the amount of concentrations that I was using, and the time that I used for the experiment to last was enough to allow sufficient osmosis to occur. I will do this because then I can find the average of the results, when all the anomalous results have been eradicated I will know that I have taken enough repeats. Effects of Temperature Observe the effect of osmosis in potato cells in solutions with different temperatures.
Results I created a graph compiled of all the evidence in the tables in a concentration m and mass change % g comparison. Based on our data, the bags that contained water at 55 degrees Celsius had a much greater rate of osmosis than the bags at 15 degrees Celsius. The potato tuber in the 0m solution distilled water reacted as I expected it to, its mass increased as the concentration of glucose inside of the potato was greater than on the outside, thus the water entered the potato to try and create equilibrium. By measuring the mass of the potato cylinders, you will be able to find out if water has entered or left the potato cells. This means that the mass of the potato piece will increase and the potato will feel turgid. The Effects of Temperature on the Rate of Osmosis Hypothesis Graph If a dialysis bag filled with a sugar solution is put in a cup of 44°C, 20°C, and 6. During my preliminary test I also found that leaving the potato tuber in the test tube for 24 hours was not long enough to ensure that the process of osmosis was complete.
Concentration, Mass, Potato 718 Words 3 Pages Osmosis in Potato Tubers Andrew Dickson Background When a plant cell is bathed in a solution of the same concentration isotonic as its intracellular environment, its mass and volume remain the same. In plants, osmosis is carried out everywhere within the cells of the plant World Book, 1997. Volume of Glucose Solution — The more solution there is the larger quantity the glucose has to equalize over. V: Water volume Variables ¿ How does temperature affect osmosis in potatoes? This was also the case with the length. Chemistry, Concentration, Diffusion 1173 Words 4 Pages Osmosis Lab Introduction: In order for cells to interact with their environment, molecules must be able to move through the cell membrane. The use of phones can be negative and positive.
Repeat steps 1-6 for trial 2 Cold Water Procedure 1. Step 4: To create the 40% salt solution. In this experiment, we put pieces of potatoes into test tubes with sugar solutions of different concentrations and leave them there over night. A cell membrane lets smaller molecules such as water through but does not allow bigger molecules to pass through. This led to Lab 2, where potatoes were placed into each of the six solutions with different glucose concentrations. Measuring Cylinder — To measure volumes of solutions distilled water and glucose solutions 0.
By placing the six de-shelled in different sucrose solutions, we tested the rate of osmosis. It is the movement of water from high water concentration to low water concentration. Blotting Paper — Used to remove excess liquid from the potato tubers. It was ensured that 100mL of solution was used in each test. The purpose of this experiment is to demonstrate how living cells rely on osmosis, the diffusion of water. In the experiment with 0.