Investigating Osmosis
Introduction:
Over the past term we have been studying osmosis and diffusion. It is
when you put a strong solution into a weaker solution such as sugar.
Osmosis is described as the passage of water from a region of high
water concentration through a semi-permeable membrane to a region of
low water concentration. If the solutions on each side are equally
concentrated then there will be no movement of water across the
membrane. If the solution outside the cell has a low concentration,
the cells become affected because water is flowing into them, if the
solution outside the cell is of high concentration the water flows
out. If two solutions of different concentration are separated by a
semi-permeable membrane which is permeable to the smaller solvent
molecules but not to the larger solute molecules, then the solvent
will tend to diffuse across the membrane from the less concentrated to
the more concentrated solution. This process is called osmosis. Pure
water has a molecular weight of 18 grams/mole, so its concentration is
approximately 55 Molar. Osmosis is why drinking salty water could
damage your body. When you put salt water in your stomach, osmotic
pressure begins drawing water out of your body to try to dilute the
salt in your stomach. This could cause you to dehydrate.
[IMAGE]
Definition of osmosis:
Osmosis is the passage of water from a region of high water
concentration through a semi-permeable membrane to a region of low
water concentration.
Aim:
To see how concentration affects osmosis on a potato.
Prediction:
I predict that the higher the concentration of molar solution, the
more the potato chip will weigh.
Plan:
A potato will be cut using a cork borer and knife to equal lengths;
this will keep the surface area equal. Then the starting mass will be
measured. To each test tube a cut piece of potato will be added and
its mass labeled on paper. These will be left for 5 minutes.
- The nurse’s mistake will increase the saltiness due to the double amount of saline in the bag.
...ond sets of data concluded that sucrose, glucose, and salt are hypotonic solutions that will remove water from a cell due to their tonicity. In the final part of the lab, results concluded that water potential moves along its concentration gradient (high to low) in an attempt to maintain equilibrium. It was determined that the orange and green solutions were hypotonic as they added water to the cells, whereas the blue, red, purple and yellow solutions were hypertonic as they sucked water from the cells.
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 is a special case of diffusion. It is when the passage of water from a dilute solution moves through a semi-permeable membrane to a more concentrated solution. Selective permeability is whether solutes can cross through a membrane freely or not at all. Plant cells and animal cells differ in that plant cells have a strong cell wall and animal cells do not have cell walls. They both can undergo osmosis and both lose water, however the cell wall of plant cells prevent the cells from bursting whereas animal cells will burst because they have no cell wall.
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.
Abstract: In this lab, carrots were placed in sugar solutions of varying sugar concentrations. The effects of osmosis and cellular diffusion are going to be observed as the carrots gain or lose weight in the solutions over the period of time. The weights of the carrots will be measured after 30 min, and again after 24 hrs. The purpose of this lab is to find out how the cells in carrots will react to various sugar concentrations. The idea is that the cells will absorb the water and become heavier and supple.
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.
The experiment is aimed at giving a better understatement of osmosis process and the different conditions in which osmosis occurs.
Potato cells, diffusion, osmosis, and tonicity by Michaela Cupp. Science Experiment Topic: Which solution will help absorb the red dye into the potato cells, pure water or 50% salt water? Related research topics/terms: Diffusion, Osmosis, Tonicity are things I found during my experiment. An explanation of the links between the topics:
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.
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.
The variables I could change would be the temperature of the solution. The higher the temperature of the solution the more osmosis would occur. The surface area of the potato strip, the larger the surface area the more osmosis would occur as there would be more area exposed for osmosis to take place. The concentration of the solution will affect osmosis, the higher the concentration the less osmosis would take place. The duration of the experiment also affects how much water is gained/lost by osmosis as the longer the duration is, the more osmosis would take place (osmosis would stop as soon as it reaches an equilibrium of water content inside and outside the cell.
water in the potato, then the water will go out of the potato and into
when to do it etc. This should lead me to good results at the end of