Osmosis Experiment Planning
Introduction
Osmosis is the passage of water molecules from a weaker solution into
a stronger solution, through a partially permeable membrane. In this
case, the tiny holes in the membrane of the potatoes will allow the
water molecules to pass through in and out of the solution and the
potato, depending on the concentration gradient of the two substances.
So in this case, when the water concentration is lower in the tissue,
the water will go inside the tissue of the potato, and the potato will
grow in length, and if there is very little difference in the two
water concentrations, there shouldn't be such a big change in length.
If there is a higher concentration of water in the potato, the water
will go out of the potato. Water molecules have random kinetic energy
meaning they move around where they want and wherever they want.
The potato, cut up into pieces, will need some sort of element to
survive, and in this experiment, it would be light and water. With
both of these sources, the potato will keep on working, until it dies
of either lack of water, too much water. When the concentration
gradient is lower in the potato, the water will transfer from the
solution to the potato.
The chip will not continue to grow in size because the cell wall will
stop expanding when all the cells become turgid. When the change in
length is 0 it means that the concentration gradient inside the
cylinder is the same as that outside the cylinder. This is known as
osmotic equilibrium and means that the exact same amount of water
p...
... middle of paper ...
...³ distilled water and 24cm³ 1 molar sucrose, 8cm³
distilled water and 32cm³ 1 molar sucrose and 40cm³ of 1 molar sucrose
were placed into the remaining test tubes. After this a chip of each
length was placed in each tube and sealed with a bung.
After 60 minutes the stop clock was stopped and the test tubes removed
from the water bath and placed into a rack. The bungs were removed and
the chips measured again using callipers. The results were recorded
and the chips placed back into their respective solutions. The tubes
were then placed back into the water bath and the stop clock
restarted. The next day we revisited the experiments at approximately
10 minutes before they had been started the day before. When the clock
read 24 hours we proceeded to again measure the lengths of the chips.
The results were recorded again.
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.
...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.
The experiment was a successful when fulfilling the expectations of the potato slice within the three solutions being mentioned on the previous paragraphs. The results when the potato slices were submerged in the isotonic solution were not surprising; the potato maintained its proper shape and weight. The hypotonic solution resulted in the potato slice to have a much tougher and heavier texture compared to its original state of form. While the potato slice within the hypertonic solution caused it to be flimsy and
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 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.
Osmosis is the movement of water, through a cell membrane, from higher to lower concentration. A solution can be hypertonic, hypotonic, or isotonic when compared to a cell. Hypertonic solutions occur when the solution is more concentrated compared to a cell and the water moves out of the cell and into the solution. Hypotonic solutions occur when the solution is less concentrated compared to a cell and the water moves into the cell and out of the solution. The last type of solution, isotonic, occurs when the solution has the same concentration compared to the cell. The water moves both in and out of the cell when a solution is isotonic. During the lab, the egg represented a cell and how a cell would react to different types of solutions. The three solutions that the egg was placed in were vinegar, corn syrup, and water (distilled). image.png
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 Introduction 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. The aim of the investigation is to find the variables that affect the rate of osmosis and how they affect the rate of reaction. The variables that affect the rate of reaction of osmosis are, · The surface area of the object, · The concentration of the solution, · Temperature of the experiment Surface area If the surface area of the object is larger then more molecules can pass through the semi-permeable membrane. This will ultimately increase the rate of reaction. [IMAGE] [IMAGE] [IMAGE][IMAGE] Small surface area Large surface area Concentration
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.
cork borer; we made sure we cut off the edge with the skin on it, as
Plan On Osmosis Experiment Introduction Knowing that osmosis (a diffusion of water) will occur across a semi-permeable membrane whenever there is a difference between the water concentration on the two sides of the membrane. And knowing that when this happens to all they will either become turgid if water flows into them, or plasmolysed if the water flows out of them, and therefore change their volume, we are going to test the hypothesis that: "If the concentration of a solution into which a cylinder of potato cylinders are placed is greater than a certain level the cylinder will contract, and if the concentration is less than that it will expand. " Aim 1. To investigate the effect of increasing the concentration of sucrose solution on the rate of osmosis in potato cells. 2.
I blended on high to make the potatoes more liquid-like. I grabbed the cheesecloth and placed on the top of the blender. I poured the potato extract on the container and labeled it. I found out that I have to make 1% sugar solution so I grabbed the sugar and measured into 5 grams on the scale. I added 5 grams of sugar on 250 ml graduated cylinder and poured the water into the cylinder. I mixed the sugar with water and poured it into the saucepan. I refilled the water into the graduated cylinder and poured into the saucepan. I turned on the heat of the stove and saw the sugar dissolved. I poured into a container and labeled 1% sugar solution. I repeated the same thing with 1% salt solution by using 1 gram of salt and filled the water into graduated cylinder by 100 ml. I answered question three. In the first experiment, I grabbed four transfer pipets and used it to put solutions into the test tubes by 3ml. I labeled it and placed into the plastic cups so it can stand upright. I grabbed each test tube and poured 2 ml of catalase solution into it. I also tapped and swirled to measure the bubbles by using the ruler. I wrote the numbers into the lab report. In the second experiment, I labeled the room
Type of tissue- this will be controlled by using only one type of tissue, which is the potato