That is to say, all molecules that are small enough to squeeze through pores move unrestrainedly across the membrane, being directed by the law of diffusion. In this experiment the semi-permeable membrane is the cell surface membrane. Osmosis is defined as the diffusion of water across a cell membrane. The color of the salted water one is dark brown; not a nice image of how you would like your potatoes preserved! The teacher should review the equipment and laboratory facilities available. The other 2 slices that were submerged in distilled water were later a bit thicker and denser. In general, the solvent shifts from a hypotonic, less concentrated, to a hypertonic, more concentrated, solution Myers 334. Water potential y is composed of two main things, a physical pressure component, pressure potential yp , and the effects of solutes, solute potential ys.
It is widely apparent that osmosis is an extremely significant process to be studied and was the best choice for our experiment, which provided us with logical results through the study of osmosis process. We then added the same amount of starch solution. Therefore, the effect of osmosis is uncorrelated with the kind of solute, but only with the water content of the two solutions. Lastly, in hypotonic solution water shifts away from this solution to amore concentrated one Myers 345. Write a scientific lab report.
If the solutions differ in concentration, the area with the higher solute concentration is hypertonic and the area with the lower solute concentration is hypotonic. Red Blood Cells in different concentrations of solutions. Diffusion is when molecules move from an area of higher concentration to an area of higher concentration. The difference in mass is not enough to go by because the initial masses of the dialysis bags were not all the same. Diffusion is one result of this molecular movement. Turgor pressure of a plant cell is usually attained while in a hypotonic solution.
Label 4 lengths of dialysis tubing. Also, chemical potential is used for the measurement of molecular flow through the cell membrane or other barriers with selective permeability. I did this experiment last week and I'm writing a lab report and needed some more. There are many different factors that can affect the rate of osmosis such as temperature, particle size, and the size of the concentration gradient. Mullins Date: January 20, 2011 Introduction This lab was designed to explain the different things osmosis does.
The solute dissolved substance concentration affects the rate of osmosis causing it either to speed the process up or slow it down. Free essay sample Osmosis Potato Lab Report Biology 4u and more Essay Examples on Chemistry topic from is a great source of ideas. Potato Core Experiment We placed the potato cores in cups containing different concentrations of sucrose solutions to find out if the potato would gain or loose weight. I then placed the tubes back into their respective solutions. Additionally, there are different experiments processes with different materials explaining the same concept of osmosis. Also, the equipment we used had uncertainties, which means that the equipment we used might not be accurate.
Lab 1E — Using the materials gathers, prepare a wet mount slide of the epidermis of an onion. For the experiment, the following materials were used: potatoes, petri dishes. This is where the line on a graph would cross on the… 1928 Words 8 Pages Biology Lab Report 2 Investigating the phenomenon of Osmosis in plant tissues: Potato in different concentrations of NaCl Tutor: Maria Tsaousidou By Marina Gkritzioudi Biology Lab Report 2 Investigating the phenomenon of Osmosis in plant tissues: Potato in different concentrations of NaCl Tutor: Maria Tsaousidou By Marina Gkritzioudi Investigating the phenomenon of Osmosis in plant tissues: Potato in different concentrations of NaCl Introduction: Osmosis is the movement of… 1023 Words 5 Pages Egg Osmosis Lab Report Yen Do Period 2 Introduction: Cells in all living things have an outer layer known as the cell membrane. Next we removed the dialysis bag from the beaker, dried it off, and measured its mass. Variables Variables Control of the variables Independent variable My independent variable was the I manipulate my variable by weighting the quantity of salt in water. To carry out this type of experiment, you need to.
The opposite goes for the concentration higher than 0. We concluded that as concentration of the The following hypothesis was made in regard to effect of the concentration gradient on the rate of diffusion: The higher the concentration gradient, the faster the rate of diffusion. As it has been mentioned earlier, the phenomenon of osmosis is connected with the movement of water molecules through a membrane with selective permeability. When we submerged the potato in the solution, it would be better if we submerged the potatoes in the same time to make the results more accurate, we also could have peeled the potatoes completely in order to allow osmosis to happen faster and more efficiently. This is verified because the weight of the dialysis tubing and the beaker both changed. Mass of Starch in Beaker g Mass of Solution in Beaker g Mass of Solution in Dialysis Tubing g Before Osmosis 2.
We hypothesized that the similarity of the potato would be 0. The structure of the cell membrane consists of the phospholipid bilayer organized by the arrangement of hydrophilic heads and hydrophobic tails. The purpose of this lab is for students to observe the qualitative effects of osmosis in plant cells and to quantitatively measure the rate of osmosis in potato slices. The tubing may not have been submerged in the beaker for long enough to reach equilibrium. Osmosis can be observed by putting a Potato Osmoscope. In this experiment, you will determine the weight of several potato tuber cylinders.