The semipermeable membrane surrounding a cell is called the cell membrane. The cell membrane plays a major role in controlling what is able to come in and out of the cell. The traits of the cell membrane are important in passive transportation. Passive transportation is the movement of materials into, out of or within a cell that does not require energy from the cell. A type of passive transportation is osmosis. Osmosis is the diffusion of water into and out of cells from an area of higher concentration to an area of lower concentration. In this lab, a cell is represented by an egg. The cell, or egg, is then placed into three types of different solutions to evaluate the effects of osmosis. In the first solution the egg was placed into vinegar for two days. When it was placed in the vinegar, the egg got larger and gained weight. In the beginning of the experiment, the untouched egg weighed 56.7 grams, but after being submerged into vinegar, the egg weighed 65.6 grams. The egg had a 15.7% increase in mass from the original, untouched egg to vinegar. Water went into the egg making it a hypotonic solution. The egg was more concentrated than the solute, so the water moved into the egg until it reached osmotic balance. We observed that the egg, that used to have a hard, white shell …show more content…
When it was placed into the corn syrup, the egg got significantly smaller and lost weight. When 24 hours passed, we took the egg submerged in corn syrup out and weighed it. It weighed only 36 grams and had a 45.1% decrease in mass from vinegar to corn syrup. The egg now looked dark yellow and as if a rice roll was surrounding it. Water moved out of the egg making it a hypertonic solution. The egg was less concentrated than the solute, so the water moved out of the egg until it reached osmotic balance. Overall, we can conclude that when a semi permeable cell is placed in a hypertonic solution, water will move out of the
Investigation of the Concentration and the Effect of Sucrose on Osmosis in Apple and Potato Tissues
Investigating Osmosis In A Potato Introduction: "Osmosis is typically defines as the flow of one constituent of a solution through a membrane while the other constituents are blocked and unable to pass through the membrane. Experimentation is necessary to determine which membranes permit selective flow, or osmosis, because not all membranes act in this way. Many membranes allow all or none of the constituents of a solution to pass through; only a few allow a selective flow. In a classic demonstration of osmosis, a vertical tube containing a solution of sugar, with its lower end closed off by a semi-permeable membrane, is placed in a container of water. As the water passes through the membrane into the tube, the level of sugar solution in the tube visibly rises.
Step 3: Q5. The salt that was placed on the egg turned into ‘sweat’ like beads on the egg. Q6. There is a higher water concentration inside the egg, causing the water to travel through the egg to the salt. The salt creates osmotic pressure on the water molecules in the egg.
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
Osmosis in Potato Tubes Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration. Diagram: [IMAGE] [IMAGE] Aim: To see the effects of different concentration of sugar solution on Osmosis in potato tubes. Key factor: In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass. Prediction: I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis.
In this lab we tested osmosis through a semi permeable membrane using dialysis bags (SCC Science Division, 2014). We also looked at osmosis in living cells of potatoes. When water is moved through a semi permeable membrane that is called osmosis. Passive transport is when molecules move with the concentration gradient across the membrane with no cellular energy used. Osmosis and diffusion are examples of passive transport. There is also active transport which is when molecules move against the concentration gradient and uses energy in the form of ATP (Urry, Cain, Wasserman, Minorsky, Jackson, & Reece, 2014). There are three types of conditions that deal with osmosis that will be found in this experiment: isotonic, hypertonic, and hypotonic solutions. Isotonic is when the concentration of a solute is identical outside of the cell and inside of the cell. Hypertonic is when the concentration of solute is higher outside of the cell than inside of the cell. Hypotonic is when the concentration of a solute is less than the solutions outside the c...
Background info: hypertonic solution was used in the lab, hypertonic is the liquid substance that is going out of the egg. When a red blood cell has more water than what's outside then the water will come out and will become smaller. Hypotonic is when the water on the outside of the cell has more water than the inside, the water will go in the inside to make it run smoothly. Isotonic is when the inside and outside of the cell is each, they will stay the same.
Potato and Osmosis Investigation PLANNING: (P) Some background Information: Water Potential and Living Plant Cells Plant Cells in Pure Water: If plant cells are placed in pure water (a hypotonic solution) water will initially move into the cells. After a period of time the cells will become turgid. Turgor pressure is the pressure exerted against the cell wall by contents of the cell. At first most water movement is into the cell. As the turgor pressure increases water will begin to diffuse out of the cell at a greater rate, eventually equilibrium will be reached and water will enter and leave the cell at the same rate.
(1) In the osmosis lab I made a few predictions (a) I predicted that the egg in the hypotonic solution will swell & gain mass because, there are more h20 molecules and less solutes in the distilled water then inside the egg therefore the h20 will go into the egg. (b) I predict that the egg in the hypertonic solution will shrink and lose mass because, there are more salt molecule (solution) and less water molecules in the salt than inside the egg therefore the h20 will the egg. (c) I predict that the egg in the isotonic solution will stay the same size & mass because, there will be the same amount of solutes & H2O inside and outside the egg therefore the H2O will go inside & outside the egg. (2) My hypothesis was not supported by
The purpose of this lab was to show us what will happen when we soak the egg in the tap water overnight. When we soaked the egg in the tap water overnight, the egg appeared to be swollen. The egg also gained mass because the egg has less water concentration.
During the first day, we weighted the egg and put the vinegar in the cup. Then, we let the vinegar sit on the egg for 24 hours. The next day ,day 2, we spilt out the vinegar ,and added distilled water. We also weighted the mass of the egg ,and described the appearance of the egg on the data chart.
What is a passive transport? A passive transport is the movement of something across the membrane with no energy. There are 4 main passive transports. There is diffusion, osmosis, Facilitated Diffusion, and Filtration. Diffusion were molecules will spread out evenly into empty space. Osmosis is the movement of water across a membrane. Passive transport happens when you get Pruned Fingers. Cholera is also made by osmosis. Cholera is found in our intestines and it reverses the intestinal cells.
Most cell membranes are like that, being permeable to water and some solutes only. Osmosis is therefore the diffusion of water through a partially permeable membrane. The basic principles of diffusion apply here.
== = This experiment is based on the concept of Osmosis. Osmosis is the diffusion of water molecules from a region of high water concentration to a low water concentration through a semi permeable membrane (in this case, the cell potato cell membrane). The cell walls of the potato cells are semi permeable meaning that water molecules (which are small) can fit through but other bigger molecules such as glucose cannot pass through. The water molecules can flow both ways through the membrane, letting molecules both in and out.
In this experiment the Sodium Hydroxide solution went through three different phases where its quality and quantity changed. The first phase was called I. Preparing Approximately 0.1M NaOH, 1000mL of clear distilled water was boiled and then chilled to room temp.