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. In the diagram below on the right, we see two solutions divided by a partially/selectively permeable membrane (i.e. one that is porous, but allows water molecules through faster than dissolved substances). Text Box: Originally, the two solutions were; pure water, on the left, and sugar solution with a high sugar concentration, on the right. The pure water solution is said to have higher water potential than the concentrated sugar solution, because the water will flow from the area of high concentration of free water molecules (the dilute solution), to the area of low concentration of free water molecules (the concentrated solution). In other words, to the sugar solution. However, in this diagram we see that osmosis has been taking place for a short while, because water molecules have started to diffuse to the right, across the membrane, so that there are now many present on the right side of the membrane, and a few sugar molecules are starting to diffuse across the membrane in the opposite direction, to the left side of the membrane as we see it. Through moving from an area of lots of free water molecules, to an
When the cell has all the water it can take inside of it the osmosis
- The nurse’s mistake will increase the saltiness due to the double amount of saline in the bag.
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.
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.
An Investigation of Factors Affecting the Rate of Osmosis Introduction Osmosis is the movement of water molecules across a semi permeable membrane from a region of high water concentration to a region of low water concentration. [IMAGE] A semi permeable membrane is a membrane with very small holes in it; they are so small that only water molecules can pass through them. Bigger molecules such as glucose cannot pass through it. In actual fact water molecules pass both ways through the membrane, but because there are more water molecules in the high concentration region than the other there is a steady net flow into the lower concentration region. The lower concentration is the stronger solution, such as a glucose solution.
* We would have to leave one end open to fill it up with the different
The Functions of Osmosis Osmosis is the passive transport of water through a selectively permeable membrane, a membrane that allows certain needed particles to pass through it more easily than others. Pores in this type of membrane are large enough for water to pass effortlessly through it. The flow of water during osmosis depends on the concentration of a solute either within a cell membrane or surrounding the membrane. Water naturally flows from a hypertonic solution, an area of high concentration of solute, to a hypotonic district, a solution containing a lower concentration of solute.
Investigate the factors affecting the rate of Osmosis Planning Osmosis is the diffusion of water from a lower concentration of solute to a higher concentration of solute, through a partially permeable membrane. In a high concentration of water the amount of solute (e.g. sucrose) is low. This could be called a weak or dilute solution. In a low concentration of water the amount of solute is high. This could be called a strong or concentrated solution.
the cell. As water is lost the vacuole gets smaller as it is used to
How Osmosis In Potatoes Is Affected By Solution Concentration Aim To investigate how the concentration of a salt and water solution affects the rate of osmosis in a potato. Osmosis Osmosis is the passage of water from an area of high water concentration to an area of lower water concentration, through a partially permeable membrane (a membrane which allows small molecules like oxygen, carbon dioxide, water, ammonia, glucose etc to pass through, but does not allow larger molecules such as sucrose, starch, protein etc). Cell membranes are partially permeable, which allows water to pass from one cell to another within the organism, and also, as I will be exploring in this investigation, from outside to inside, or vice versa. Osmosis occurs when the area of liquid outside the cell contains more water particles than the area of liquid inside the cell. In the solution, the particles are moving all the time.
cork borer; we made sure we cut off the edge with the skin on it, as
going in is the same as the amount going out, so there is no overall
when to do it etc. This should lead me to good results at the end of
If the concentration of sucrose increases, then the mass of the potato will decrease. However, if the concentration of the solution in the beaker is less than that of the potato (such as distilled water), then the mass of the potato will increase. So, as the concentration of sucrose increases the rate of osmosis increases.