Investigating Osmosis Aim - In this experiment, I am going to try to find what the concentration of sucrose inside the vacuole of a potato is. Introduction - Osmosis is a special kind of diffusion, and can be defined as the movement of water molecules through a semi-permeable membrane from a region of high water concentration to a region of low water concentration, until both are the same strength. But, osmosis is the diffusion of water only and not of substances dissolved in water. Diffusion occurs because there is a vast amount of empty space between the molecules of all substances. This space is largest in gases and much smaller in liquids and solids. Molecules constantly collide and intermingle with each other, and are always at a state of random movement. Due to the spaces between molecules, this movement is much greater in gases and liquids than in solids. Diffusion is a result of the random movement of molecules and leads to an equal distribution of particles in the space they occupy. The diagram above is an example where osmosis has taken place. The weak sugar solution is separated from the strong sugar solution by a semi-permeable membrane, with the water diffusing from the weak solution until both solutions are of equal strength. However, as only water can move through the semi-permeable membrane, equal concentrations of solutions can not always be reached. Examples of everyday diffusion include : * Oxygen diffusing from airsacs in the lungs into blood capillaries around the airsacs, while carbon dioxide diffuses from the blood into the airsacs. * In the gut wall, digested food, e.g. glucose, ... ... middle of paper ... ...ge to be sure that the concentration is around 0.2M, as there is too much weight loss at values below this for it to be a higher value than 1M. Before doing the experiment, I used text books to find out more about osmosis and so this gave me a better idea of what should happen. To extend the investigation, I could experiment with concentrations of sucrose between 0.2M and 0.4M, in small intervals to find the exact amount of sucrose inside the vacuole of the potato. I could also do the experiment with different plants or fruits, to see if the concentration varies with each different thing, or is similar. I think that I do have enough evidence to support a firm conclusion that the concentration of sucrose inside the vacuole of a potato is between 0M and 1M, but an extension in the experiment would make it more precise.
could vary by as much as 4%. Assumption of SD of 2% may be not be correct.
620 0.21 0.09 0 0.005 0.148 0. 640 0.24 0.3 0 0.005 0.195 0. 660 0.99 0.18 0.01 0.01 0.95 0. 680 0.18 0.03 0.01 0.09 0.
on are at 0 before weighing the chip, as it may add some mass to the
adding on lean body mass. They are usually “stacked” which is a process of taking two or
Considering the fact that Marc has both been sweating and drinking minimal amounts of water, Marc is now dehydrated. This means he has less than the required amount of water for his body to complete the processes necessary to maintain its health. As stated in the question, the process of sweating causes the loss of more water than solutes. This means that as the level of water decreases, the level of solute concentration will increase, creating a change in the water to solute ratio.
Osmosis and Diffusion Investigation Aim: To examine the process of osmosis and diffusion. Part A: Step 1: Q1.[IMAGE] Q2. The jiggling motion is visible because the fat globules are constantly being bombarded by smaller particles. [IMAGE] Q3.
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
Osmosis Experiment Planning Aim: The main subject that I will be planning to investigate is the effects of a concentrated sucrose solution on potato cells on the basis of the Osmosis theory. Background knowledge: The plant cell and its structure To understand osmosis in detail I will need to explain the plant cell (which is the cell included in the osmosis experiment) and its cell membrane. Below I have a diagram of a plant cell: [IMAGE] Osmosis is about the movement of particles from a higher concentrated solution to a lower concentrated solution to create an ethical balance via a partially or semi permeable cell membrane. Osmosis in simple terms is the exchange of particles between the cytoplasm inside the cell and the solution outside the cell. What makes this exhange is the partially permable cell membrane.
* We would have to leave one end open to fill it up with the different
The purpose of this experiment is to investigate the effect of changing the concentration of sodium chloride solution on the rate of osmosis in tubes of potatoes. This was maintained using equal measurements of the potato tubes and applying them into the different concentrations of sodium chloride, 0%, 2%, 5%, 10%, 20% and 26%, in beakers then measuring the change in mass of the potato tubes afterwards. The time taken for all potato tubes to be placed in solution was 15 minutes. Can the concentration gradient of the sodium chloride solution influence on the rate of osmotic diffusion undergone by the potato tubes?
The experiment is aimed at giving a better understatement of osmosis process and the different conditions in which osmosis occurs.
Osmosis is the facilitated diffusion of water across the cell membrane of a cell. The inside layer of the cell membrane is hydrophilic, meaning water cannot easily pass through the membrane. The cell membrane has to have aquaporins, which are water channel proteins, that move the water across the membrane. If there is a water and salt solution outside the cell, the salt can enter the cell by diffusion, but the cell membrane is not permeable to the water. Because there is more solute solution inside the cell, there is less water. The aquaporins move the water across the membrane until equilibrium is reached.
I have chosen to look at the effect of the weight applied, as it is a
- The nurse’s mistake will increase the saltiness due to the double amount of saline in the bag.
0.000 7 63 106 55 74.7 1.245 9 70 135 90 98.3 1.638 11 85 135 70 96.8 1.613 [ IMAGE ] [ IMAGE ] Conclusion = = = =