1. Some potatoes increased in mass while others decreased due to osmosis. Potatoes that had a higher concentration increased in mass because water passed through the membrane into the potato in an effort to dilute it. Potatoes that had a lower concentration than the solution decreased in mass because water flowed through the membrane into the solution trying to dilute the solution. The water moves to the higher concentration to dilute it/maintain homeostasis, increasing or decreasing mass depending on whether it goes in or out.…
The purpose of this experiment is to observe the osmosis reaction in a potato with salt and water. In cooking cooks will soak their cut potato's in water if they will not use them immediately. This allows the potato's to be used later without turning color. The experiment shows the flow of water through the membranes of the potato with salt over a period of four hours.…
Record the length & turgidity(firmness and flexibility) of the potato cylinders in your data table (day 1).…
As the concentration of a solute in water will, through osmosis, transfer until the concentration is nearly the same both inside the cell, or in this case potato, and outside of the cell, the potato strips both gained and lost mass due to the different concentrations of sugar in water. As expected, the potato strips placed in the concentration of sugar water closest to the concentration of sugar water in a potato had the least amount of change in mass. As the potato strips placed in substance Z and substance A both changed 7%, the concentration of sugar water in a potato must be somewhere in between a concentration of 0.4 and 0.6. One source of error for this lab is that the amount of substance placed into each Dixie cup was not measured and therefore were not consistent. If this lab were repeated, it is suggested that the amount of substance be measured in order to produce more consistent results.…
My hypothesis in this experiment was that a Yukon gold potato will naturally absorb more water than a sweet potato due to the effects of osmosis. Osmosis plays a huge role in biology for a multitude of reasons. As defined by Freeman (2012) “The movement of water is a special case of diffusion that is given its own name: osmosis, occurs only when solutions are separated by a membrane that is permeable to some molecules but not others- that is, a selectively permeable membrane.”(P.90). It is also a type of passive transport, as it does not require energy.…
Aim: In this investigation I am going to work out the sugar concentration of a potato. I aim to find this out by putting potato cores into various concentrations, measuring the mass before and after. Due to osmosis the potato cores will change in mass to make the concentrations at an isotonic level, helping us to work out the mass of the potato. I predict that potato in the weaker solutions will gain mass, because some water will be absorbed by the potato to make the concentrations isotonic. Similarly, I think the potato in the stronger solutions will lose mass as they will have to lose water to dilute the stronger solution.…
Abstract: Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane. In this experiment, we learn about Osmosis and Diffusion through potato cores in different concentration of sucrose, (water, .2, .4, .6, .8, 1.0). We realized that the lower the concentration, the higher the potato cores weighed.…
Aim To observe and measure the effect of osmosis on the mass of potato using a starch solution. Introduction In order to measure the effect of osmosis, eighteen pieces of potato were cut and placed in six groups, each group of three pieces cut to weigh as close as possible to one another. For each potato group, a test tube was half filled with a starch solution varying in concentration from 0% (water) to 1%. Hypothesis…
Introduction: Osmosis is the diffusion of water from a higher concentration to a lower one through a semi-permeable membrane and occurs in the cells of organisms. It is affected by the addition of solute which would lower the water potential, making water potential and solute concentration inversely related. The concept of osmosis loosely described is that the presence of more solute outside the cell means the presence of less solvent (or water molecules in this case) and vice versa; the goal of osmosis is for the water molecules inside and outside of the cell to be equal, causing equilibrium and a stop to net water movement. The goal for a recent lab was to test whether cubes of potato would gain or lose weight depending on the amount of molar concentration of sucrose they soaked in. Solutions made of different molar concentrations of the solute sucrose were prepared before this lab. Potato cubes were weighed and recorded as the initial mass in the data. Four cubes of potato were placed into 100 mL of each solution and let stand overnight. The cubes were then taken out for the final total mass to be measured and recorded. In this experiment, the potato cubes were the dependent variables, and the molar concentrations were the independent or manipulated variables.…
The aim of this experiment was to test the effect of surface area on osmosis and the effect of solute concentration on osmosis. To test this aim to hypotheses were devised. 1) If potato pieces are immersed in various salt solutions, then the pieces with the greatest surface area to volume ratio will experience the greatest weight change, because more water can move by osmosis across the potato cell’s semi permeable membrane. 2) If potato pieces are immersed in various salt solutions, then the pieces immersed in the most concentrated solution will experience he greatest weight change, because more water must pass across the potato cells semi permeable membrane by osmosis to achieve an equilibrium. The results from testing these hypotheses did not support either and were shown to be flawed because they did not reflect the theories of osmosis relating to surface area to volume ration and salt concentration.…
The potato in the fresh water gained weight because the solute is moving toward the water. The potato in the salt water lost weight because the salt was at a high concentration level so it moved to an area of low concentration. Osmosis is the diffusion of water across a selectively permeable…
Osmosis was clearly shown since the potato cylinders decreased or increased at different concentrations of sucrose. The results supported my hypothesis because for the 0.0 sucrose concentration the average percent change in mass was 16.9%. For the 0.2 concentration the percent change was 3.59%. For the 0.4 concentration the percent change was -15.3%. For the 0.6 concentration the percent change was -27.1%. For the 0.8 concentration the percent change was -23.2%. For the 1 concentration the percent change was -15.4%. The reason for the change in mass is the process of osmosis. When the sucrose concentration was 0, the cores gained weight because the concentration in the potato cells was different from the concentration outside, which was a hypertonic solution. When the sucrose concentration was 0.2, it was an isotonic solution, so there was no major difference in mass. When the concentrations of sucrose were higher (0.4, 0.6 and 0.8), the outside solution was hypotonic because there was a decrease in the potato…
The purpose of this lab is to determine whether salt affects the movement of water in the cell. Independent variable is the factor that affects the value of variables dependent to it. In osmosis lab, the independent variables are the potato and onions. The dependent variable is the variable whose value is measured to determine the extent of the effect of another variable to it, as in an experiment. In osmosis lab, the dependent variable is the length of the potato. The controlled variables are the amount of water, amount of salt, and the size of the potato. If the potato is placed in a higher salt concentration, then the potato will decrease its size.…
The aim of this investigation was to discover the effect that water concentration had on the mass of potato tissue, and to investigate the movement of osmosis through potato tissue, osmosis being the passage of water molecules from a weaker solution to a stronger solution, though a partially permeable membrane. In this case, the membrane of the potatoes allowed the water molecules to pass through in and out of the solution and the potato, depending on the concentration gradient of the two substances.…
This overall flow of water from a dilute area of high water potential to a more concentrated solution of low water potential across a partially permeable membrane is called osmosis. I predicted that the swede cylinders which are put in a test tube with a low potential of sucrose solution would become turgid because the water molecules that are present in the swede will move away from an area of higher potential of water molecules to an area that has a lower potential of water molecules, this means that the swede sample will gain mass and become full almost to an extent where it is ready to burst. The swede samples that are going to be put in a test tube with a high potential of sucrose solution will become flaccid because the swede cylinder will have a higher potential of water molecules and so these molecules will diffuse into the sucrose solution as it has a lower water potential, this means that the potato sample will shrivel and loose mass.…