If there was one potato thicker than the other, then it may make a difference in how long it takes for the osmosis to occur. Sugar Solutions Mass before g Mass after g Change in mass g % change in mass Distilled water 3 3. As seen previously for each trial we had a different initial and a final weightthe difference that was calculated as seen in graph 1. If potatoes are placed in a solute containing sucrose, then a concentration gradient would be present and the process of osmosis would naturally occur by moving water through the semi-permeable membranes. This occurred when there was a 0. This is because plant cells have a high concentration of water whereas the salt has low concentrations.
On the other hand, if the inside of the cell has more solutes and less solvent, the solvent outside would diffuse into the cell with the same process potentially causing the blood cell to burst due to it being hypotonic. This essay aims to assess and investigate the effect of various solution concentrations on the activity of osmosis in plant tissue. We ensure that our lab reports are 100% free from plagiarism as they are written from scratch. I think if I performed the investigation with more solution per potato piece, and left it for longer, it would enable more osmosis to occur and would be a better portrayal of how the molarity of a solution affects the rate of osmosis. If both sets of results indicate the same thing, this will add to the reliability of the experiment because I will have two sets of results to support my conclusions. « Using the same balance to measure chip: To make the mass readings fairer, I will take each chip, roll the chip gently on a paper towel, to remove all excess solution, and I must not squeeze the chip. The purpose of this experiment was to determine if there are any differences between the osmolalities, the no-weight-changes of osmolalities, and the water potentials of potato cores in different solutions of different solutes.
When you calculate the percent change in mass, some of the cores will have gained weight while others will have lost weight, depending on the movement of water. I am doing this to gain some knowledge about how the potato tubers will be affected; so when I do my main experiment I will have basic knowledge on what will happen, this means I will be able to spot outliers more easily and learn from any mistakes which may have been made in the preliminary. To determine an unknown concentration of a sucrose solution using a potato. Salt, Sugar and Pure Water This experiment helps students to differentiate between different degrees of concentration gradients. When they take up water by they start to swell, but the cell wall prevents them from bursting. Place a bag in each one keep track of which bag is in which beaker 7.
This service will be useful for: At Paperap. If you have more questions about this, or need tips about science fair ideas around this topic or others , contact the author. However, I am making these statements without knowing the concentration of the solution inside the cell; if the solution outside the cell is of sufficient water concentration to still allow osmosis to occur, I would expect to find less osmosis occuring in this than in situations where the concentration of solution is of high water content. Perhaps I could have used a burette. I am going to use the concentrations 0M, 0. The two variables in this experiment would be the different molarities of the sugar solutions and the changing weight of each potato sample.
I will also measure the amount of liquid left in the boiling tube, in order to note the change if any in this. The book 'Biology For Life' by M. There was no way I could have rectified this, but it did affect the reliability of my results. Cut these sections in length exactly the same so that all the potato samples are the same size and therefore should be the same weight. Water potential is the measure of free energy of water in a solution. Planning: In this experiment I will be trying to find out the osmotic properties of a potato. The input variable will be the concentration of the solution.
What is the pressure potential of the system? The purpose of the activities is to help you review material you have already studied in class or have read in your text. Calculate the percent change of mass, showing your calculations. Four cores were placed in each 100 mL solution of 0. Scale the x-axis of your graph in units of 0. I will expect the potato that have been in the weakest solution to have gained mass and length, and become turgid feeling hard and 'stiff' to the touch. The results below show the preliminary results as you can see they are inaccurate.
Then we submerged the potato slices inside the beakers which contained water with different concentration of dissolved salt. This is because there is a higher concentration of sucrose solution in the solution compared to that in the potato chip so water from the potato will go into the solution to even it out. When we did out preliminary experiment we only used 2%, 8%, 10% and distilled water. Prediction I predict that when the sucrose concentration is low the potato chip will gain mass. Doing this preliminary experiment helped us improve our real experiment greatly. When the potato chips were placed in a solution that had a lower concentration than itself, the potato chips gained weight.
This is because the cell is fully turgid and no more water can enter. When plant cells are placed in a solution which has exactly the same osmotic strength as the cells they are in a state between turgidity and flaccidity. Cut the potato into 6 groups of 3 slices with a knife. 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? Let the bag sit for 20-30 minutes. This causes a concentration gradient across the membrane which results in a net flow of water into the cell.