After the data was completed and submitted the class data was available to compare the results of various groups in the class. Make one solution of each of the 6 different concentrations by adding the amounts of salt that were weighted according to the labels of the beakers using a lab spatula. If the two solutions are of equal concentrations, they will be isotonic. However, with the data we have, I can determine that the glucose solution made thehighest percentage of change. Come check on the experiment later in 3 days11.
If we were to prepare a solute with the same concentration as the potato, 0. Potential for water molecules to do work Isotonic, 2011 4. Diffusion is when molecules move from an area of higher concentration to an area of higher concentration. I were to perform this experiment again, I would have used a bigger piece of potatosince it would have displayed a much clear change in mass. Maintaining all variablesunchanged such as the pH, same size, and a constant temperature. The sugar was stirred in using a stirring rod until all of the solute was completely dissolved.
Lab Report on Osmosis and Diffusion Biology 1, Period 3 March 15, 2010 Lab Team: Jason Perez, Kicia Long, Chris McLemore Purpose: The purpose of this lab is to observe the acts of passive transport: diffusion and osmosis in a model membrane system. Finally, to demonstrate a hypotonic solution we used a 3 inch. In an isotonic solution, there is no net movement and there is an equal concentration of solutes and water. The smaller piece was ineffective as itwas completely disseminated by the time we checked on them again. They were placed into the test tubes containing sucrose and were to be left on the test tube rack over a 24 hour radius. The plant cell would shrink and the flower would wilt.
For each trial, in 6 plastic cups, pour 100mL of water, combine the sugar that in which corresponds to the percentage of sugar. Also, through this experiment, students know some basic indexes to assess the efficiency of pumps used. The water moves because the membrane is impermeable to the solute and the solute concentrations may differ on either side of the membrane. This guide tells you about the structure and style that is required for a psychology laboratory. Leave the potato fries to sit for 24-hours. The higher the solute in solvent, then there will be a higher rate of osmosis through the diffusion gradient forming a hypertonic or hypotonic solution.
How do we make 1M sucrose solution? Without plants there will be no organism as they are the primary producers of our food web. I then placed the tubes back into their respective solutions. Brownian motion and diffusion can play a major role in the transportation of different particles in many different cellular processes. Cut potatoes into fries with a fry cutter and weigh 12 white potato fries and 6 sweet potato fries. This condition can exhibit lethargy, vomiting and not being able to breathe. In this experiment the semi-permeable membrane is the cell surface membrane.
The results of the osmosis in plant cells show that the more concentrated the sodium chloride, the more the potato shrunk. Over three days we tested the egg in three different solutions to observe the changes. What is the solute concentration of potatoes? Osmosis was allowed to occur for 5 minutes and then all of the tubes were removed from the water. This would happen by using similar sizes and lengths of potatocylinders and applying them into different concentrations of sucrose 0,10%, 30%, 50%, 70% in test tubes then measuring the change in massof the potatocylinders afterwards. Category: Lab Report; Title: Water Potential of Potato Cells. The slope of this graph is around -24. 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.
Solvent with equal or no solute forms an isotonic solution. Apparatus: two glass containers, two potato. If the concentrations are the same, being isotonic, there would be no osmosis occurring, and therefore no change in mass. The next day, the potato slices were to be taken out and measured again. And then add that to your salt. A more specified form of diffusion is osmosis , what was primarily focused on in this lab, and it is the movement of water across a membrane, again from an area of high concentration to low concentration. Introduction - Osmosis is the process by which water molecules move from a region of low solute concentration to an area of high solute concentration through a semi permeable cell membrane until the concentration of water molecules in and out of the cell is at equilibrium.
Methods To perform the experiment gloves and safety goggles were obtained. A hypotonic solution is a solution in which the concentration of dissolved substances is lower than the concentration inside the cell. Neither you, nor the coeditors you shared it with will be able to recover it again. The opposite would occur as well, if the concentration of sucrose in the elution is more than that of the potato, then the potato would expand and gain in mass. Osmosis is the key to understanding this issue. We provide expert writing and editing services for all kinds of academic, scientific and professional documents in all academic and scientific areas. There are two main reasons for doing this: 1 Ease of communication: it is easier to find what you want from a study if it is written in the standard format.
Repeat previous step for a second set 5. Next, another group member cut the cylinder in half vertically and placed the pieces into the water beaker recording the time. There were no direct correlations between the findings of both experiments. Obtain a 30 cm piece of 2. Results could have been more accurate if all of the potatoes were placed in each test tube and taken out of each at the exact same time.